12:12 PM - Daulton Jefferies (OAK) (elbow) had his cast removed Monday and is now using a brace that allows for adjustable range of motion on his surgically repaired elbow, the Associated Press reports.

2:31 PM - Daulton Jefferies (OAK) Athletics Matt Kawahara of the San Francisco Chronicle that Jefferies underwent Tommy John surgery Friday to repair UCL damage in his right elbow.

2:31 PM - Daulton Jefferies (OAK) Athletics Matt Kawahara of the San Francisco Chronicle that Jefferies underwent Tommy John surgery Friday to repair UCL damage in his right elbow.

5:29 PM - Daulton Jefferies (OAK) (thoracic outlet syndrome) won't return this season, Matt Kawahara of the San Francisco Chronicle reports.

5:40 PM - Daulton Jefferies (OAK) will undergo surgery to address his thoracic outlet syndrome, Matt Kawahara of the San Francisco Chronicle reports.

2:41 PM - Daulton Jefferies (OAK) will visit Dr. Gregory Pearl on Tuesday in Dallas to get a second opinion on his thoracic outlet syndrome diagnosis, Martin Gallegos of MLB.com reports.

2:45 PM - Daulton Jefferies (OAK) manager Mark Kotsay said Jefferies (arm) played catch Wednesday, Matt Kawahara of the San Francisco Chronicle reports.

2:31 PM - Daulton Jefferies (OAK) (arm) was transferred from the 15-day injured list to the 60-day injured list Sunday, Matt Kawahara of the San Francisco Chronicle reports.

8:21 PM - Daulton Jefferies (OAK) was diagnosed with thoracic outlet syndrome Friday, Matt Kawahara of the San Francisco Chronicle reports.

5:11 PM - Daulton Jefferies (OAK) was placed on the 15-day injured list with right arm nerve irritation Friday, retroactive to May 19, Martin Gallegos of MLB.com reports.

7:37 PM - Daulton Jefferies (OAK) (1-7) is experiencing biceps tightness and is undergoing an MRI after Wednesday's start against the Twins, Martin Gallegos of MLB.com reports. He took the loss after surrendering six runs on seven hits with five strikeouts and three walks across four innings.

7:58 PM - Daulton Jefferies (OAK) (1-5) allowed four runs on seven hits over five innings Sunday, striking out three and taking a loss against the Twins.

3:42 AM - Daulton Jefferies (OAK) (1-4) allowed six runs on 11 hits while striking out four over five innings to take the loss against Tampa Bay on Monday.

11:13 PM - Daulton Jefferies (OAK) (1-2) allowed one run (none earned) on three hits and no walks while striking out five across six innings to take the loss Wednesday against Baltimore.

11:31 AM - Daulton Jefferies (OAK) (1-1) took the loss Friday, allowing two runs on seven hits and a walk over 4.1 innings as the A's fell 4-1 to the Blue Jays. He struck out two.

8:57 PM - Daulton Jefferies (OAK) (1-0) yielded two hits and two walks over five shutout innings Sunday, striking out two and earning a win over the Phillies.

8:36 PM - Daulton Jefferies (OAK) lines up to start the third game of the season Sunday against the Phillies, Matt Kawahara of the San Francisco Chronicle reports.

8:26 PM - Daulton Jefferies (OAK) will be sidelined the next 2-to-3 weeks with a flexor strain in his right elbow, which rules him out for the rest of the regular season, Shayna Rubin of The San Jose Mercury News reports.

5:51 PM - Daulton Jefferies (OAK) was placed on the injured list with right elbow ulnar neuritis on Saturday.

5:54 PM - Daulton Jefferies (OAK) will start Saturday's game against the Angels, Matt Kawahara of the San Francisco Chronicle reports.

3:08 PM - Daulton Jefferies (OAK) fired 3.1 scoreless innings in a loss to the Rangers on Sunday, allowing three hits and recording two strikeouts.

3:18 PM - Daulton Jefferies (OAK) has allowed an earned run on three hits while recording two strikeouts over 3.1 innings in his first two appearances since his promotion from Triple-A Las Vegas on Aug. 27. He's also hit one batter.

3:23 PM - Daulton Jefferies (OAK) was recalled from Triple-A Las Vegas on Friday.

12:09 PM - Daulton Jefferies (OAK) was optioned back to Triple-A Las Vegas on Sunday.

10:25 PM - Daulton Jefferies (OAK) (1-0) allowed three earned runs on three hits and three walks while striking out three across five innings, earning the win over the Angels on Sunday.

3:12 PM - Daulton Jefferies (OAK) Athletics recalled Jefferies from Triple-A Las Vegas ahead of his scheduled start Sunday against the Angels.

3:01 PM - Daulton Jefferies (OAK) will be called up to start Sunday's game against the Angels, Matt Kawahara of the San Francisco Chronicle reports.

11:59 AM - Daulton Jefferies (OAK) (biceps) fired four scoreless innings for Triple-A Las Vegas in a loss to Salt Lake on Monday, allowing seven hits and no walks while recording a strikeout.

3:14 PM - Daulton Jefferies (OAK) (biceps) is starting Monday's game for Triple-A Las Vegas, Melissa Lockard of The Athletic reports.

3:29 PM - Daulton Jefferies (OAK) will be placed on the injured list with right biceps tendinitis to open the minor-league season, Matt Kawahara of the San Francisco Chronicle reports.

6:38 PM - Daulton Jefferies (OAK) is scheduled to pitch at the alternate site on the same day as Cole Irvin pitches for the big club as Oakland looks to keep its options open, Martin Gallegos of MLB.com reports.

11:56 PM - Daulton Jefferies (OAK) is a leading candidate to fill the rotation vacancy created by Mike Fiers' (hip) placement on the injured list Friday, Martin Gallegos of MLB.com reports.

3:10 AM - Daulton Jefferies (OAK) fired four scoreless innings in a Cactus League win over the Rockies on Tuesday, allowing two hits and no walks while recording seven strikeouts.

3:19 PM - Daulton Jefferies (OAK) making his second Cactus League start Saturday against the Mariners fired two scoreless innings during which he allowed a hit and a walk while recording three strikeouts.

1:19 PM - Daulton Jefferies (OAK) was impressive during his one-inning start in Sunday's Cactus League loss to the Dodgers, Martin Gallegos of MLB.com reports.

6:38 PM - Daulton Jefferies (OAK) Athletics optioned Jefferies to their alternate training site Sunday.

7:22 PM - Daulton Jefferies (OAK) (0-1) took the loss in Game 1 of Saturday's doubleheader against the Rangers after surrendering five runs on five hits with one strikeout and two walks over two innings.

2:39 PM - Daulton Jefferies (OAK) was called up by the Athletics as the 29th man ahead of his scheduled start for Game 1 of Saturday's doubleheader.

4:04 PM - Daulton Jefferies (OAK) will be called up from the alternate training site to start one of the games in Saturday's doubleheader against the Rangers, Susan Slusser of the San Francisco Chronicle reports.

2:28 PM - Daulton Jefferies (OAK) is on the top of the depth chart if Oakland needs to promote a starting pitcher from the alternate training site, Susan Slusser and Matt Kawahara of the San Francisco Chronicle report.

6:15 PM - Daulton Jefferies (OAK) confirmed Jefferies is dealing with a right biceps strain, Shayna Rubin of The San Jose Mercury News reports.

2:26 PM - Daulton Jefferies (OAK) (biceps) underwent an MRI which revealed no elbow issues, but he'll visit a specialist Monday for his upper biceps strain, Martin Gallegos of MLB.com reports.

12:25 PM - Daulton Jefferies (OAK) has been diagnosed with a biceps strain and will undergo an MRI on Thursday, Susan Slusser of the San Francisco Chronicle reports.

6:45 PM - Daulton Jefferies (OAK) Bob Melvin said Jefferies was removed from Monday's Cactus League game against the Brewers with a biceps issue, Susan Slusser of the San Francisco Chronicle reports.

4:36 PM - Daulton Jefferies (OAK) exited Monday's Cactus League game against the Brewers with a trainer, Shayna Rubin of The San Jose Mercury News reports.

4:09 PM - Daulton Jefferies (OAK) was added to the Athletics' 40-man roster Wednesday.

12:55 PM - Daulton Jefferies (OAK) will finish the season on the 7-day injured list with Double-A Midland after reaching his innings limit, Melissa Lockard of The Athletic reports. "His last game was his highest velo game of the year," Midland pitching coach Steve Connelly said. "He basically sat 95. It was really good to see. We all got together and talked it out. He's at his innings limit. We could try to push it or we could say, 'Congratulations, great year and next year you'll be ready to go hopefully into late October.'"

1:26 PM - Daulton Jefferies (OAK) is 0-1 with a 2.57 ERA, 0.90 WHIP and 18:0 K:BB across 21 innings over seven appearances (five starts) with Double-A Midland.

5:57 PM - Daulton Jefferies (OAK) is listed as healthy to start the season for High-A Stockton, Jonathan Mayo of MLB.com reports.

9:05 PM - Daulton Jefferies (OAK) (elbow) is back to throwing 95 mph off a mound and will make his first rehab start in an Arizona League game next week, Susan Slusser of the San Francisco Chronicle reports.

7:03 AM - Daulton Jefferies (OAK) (elbow) could join the rotation at High-A Stockton by midseason, MLB.com's Mike Rosenbaum reports.