The White Sox placed Wilson on the 15-day injured list due to a lower-back strain.

Wilson has appeared in 10 games since being recalled by the White Sox after the All-Star break, allowing 13 runs (12 earned) on 11 hits and nine walks while striking out eight across 8.2 innings. Gus Varland was recalled from Triple-A Charlotte in a corresponding move.

The White Sox recalled Varland from Triple-A Charlotte on Saturday.

Chicago placed reliever Steven Wilson (back) on the 15-day injured list in a corresponding move. Varland was claimed off waivers by the White Sox on Aug. 2 after being designated for assignment by the Dodgers three days prior. He has a 3.00 ERA and 1.83 WHIP across six major-league innings this season.

The White Sox claimed De Los Santos off waivers from the Yankees on Saturday.

De Los Santos will move on to his third team in less than a month, as the Padres traded him to the Yankees on July 30 before he New York designated him for assignment Wednesday. Though he was moved off the Yankees' 40-man roster after giving up seven earned runs in a 1.2-inning relief appearance against this same White Sox squad, Chicago evidently felt that De Los Santos' stronger body of work over parts of six big-league seasons made him worthy enough for a spot in the bullpen. Since he doesn't have minor-league options remaining, De Los Santos will report to the big club.

The season-ending elbow surgery Wantz required in July wasn't a Tommy John procedure, MLB.com reports.

When the Angels organization announced that Wantz had season-ending elbow surgery, not many details were provided, leading to some speculation that he underwent a Tommy John procedure. Though the exact nature of the surgery still hasn't been clarified, the fact that it wasn't a Tommy John repair will shorten the right-hander's timeframe for a return. Wantz is currently rehabbing in Arizona and could be ready to pitch during spring training.

The Athletics optioned Klein to Triple-A Las Vegas on Saturday.

Klein gave up five earned runs on two hits and four walks while recording one strikeout in 1.2 innings across three appearances since the Athletics acquired him from the Royals at the deadline as part of the return for Lucas Erceg. The 24-year-old righty walks too many batters (16.3 percent walk rate at Triple-A, 15.8 percent walk rate in the majors) to work in high-leverage situations anytime soon.

The Athletics selected Holman's contract from Triple-A Las Vegas on Saturday.

The 24-year-old reliever has a 0.92 ERA, 0.89 WHIP and a 30:13 K:BB with four wins and three saves in 29.1 innings over 23 appearances in the Pacific Coast League. Holman, a righty, won't be unseating Mason Miller in the ninth inning, but he could soon establish himself as one of Oakland's most promising relievers.

The Orioles optioned Baker to Triple-A Norfolk on Saturday.

Baker logged a scoreless inning Friday, and he could be summoned back to the majors the next time Baltimore needs a fresh bullpen arm. Cade Povich was recalled from Triple-A in a corresponding move ahead of his scheduled start Saturday versus the Red Sox.

The Rays recalled Alexander from Triple-A Durham on Saturday, Tricia Whitaker of Bally Sports Sun reports.

The move comes with Tampa Bay placing Zack Littell on the 15-day injured list due to right shoulder fatigue. After he was scratched from his start with Durham on Friday, Alexander will most likely step into Littell's spot in the rotation against the Diamondbacks on Sunday, when the Rays will likely deploy the lefty as a starter or bulk reliever. Alexander owns a 5.20 ERA and 1.28 WHIP over 71 innings with the big club this season.

Hanifee tossed two scoreless innings of relief in Friday's 3-0 loss to the Yankees. He walked one and struck out two.

Hanifee followed opener Beau Brieske, who worked the first inning. Hanifee was effective once again in relief, and after a rough first appearance of the season back on Aug. 1, the righty has now logged nine scoreless innings in his last five outings. The 26-year-old is still in a mostly low-leverage role at the moment, but Hanifee could move up the bullpen pecking order if he keeps pitching well.

Brieske (1-3) allowed one run on a hit and two walks across an inning of work to take the loss Friday against the Yankees. He struck out one.

Brieske served as the opener and labored through a tough first inning, as he needed 30 pitches to finish the frame. The Tigers ended up getting blanked, so the one run was enough to saddle the righty with the loss. Brieske has now started five games this season among 29 appearances overall, but he's yet to cover more than three innings in any outing, so the starts aren't equating to opportunities for wins.