Warren was recalled from Triple-A Sacramento on Tuesday, Amy Gutierrez of the Giants' official site.

Warren's last stint in the bigs was in 2023 for the Angels before undergoing Tommy John surgery. After signing with the Giants in February, he has recovered and spent the 2024 campaign with Triple-A Sacramento, where he has a 4.95 ERA overall. However, the 28-year-old has not allowed an earned run in his last eight outings and boasts a 1.54 ERA since July 14. In a corresponding move, Jordan Hicks was placed on the 15-day injured list with right shoulder inflammation.

The Cardinals recalled O'Brien from Triple-A Memphis on Tuesday, Katie Woo of The Athletic reports.

O'Brien made the Cardinals' Opening Day roster but suffered a flexor strain in his first appearance and missed the remainder of the first half. He has pitched well since resurfacing at Memphis, posting a 1.35 ERA and 9:5 K:BB over 13.1 innings, to earn another look with the big club.

The Cardinals designated Armstrong for assignment Tuesday, Katie Woo of The Athletic reports.

Armstrong was acquired from the Rays in the Dylan Carlson trade and has pitched well with a 2.84 ERA and 12:2 K:BB over 12.2 innings. The Cardinals are likely hoping the right-hander gets claimed so they can clear a bit of salary. Riley O'Brien will replace Armstrong on the roster and in the bullpen.

The Cubs recalled Palencia from Triple-A Iowa on Tuesday, Maddie Lee of the Chicago Sun-Times reports.

Palencia hasn't pitched well during his time with the big club this season, collecting a 6.55 ERA and 12:8 K:BB over 11 innings. Jack Neely was sent down in a corresponding move.

The Cubs optioned Neely to Triple-A Iowa on Tuesday, Maddie Lee of the Chicago Sun-Times reports.

Neely was roughed up for six runs over four innings during his brief first stint in the majors. He'll be replaced on the roster and in the bullpen by Daniel Palencia.

The Cubs recalled Thompson from Triple-A Iowa on Tuesday, Maddie Lee of the Chicago Sun-Times reports.

He'll absorb the roster spot vacated by Julian Merryweather (knee), who went on the 15-day injured list. Thompson, 29, has posted a 3.50 ERA and 26:10 K:BB over 18 innings during his time with the big club in 2024.

The Cubs placed Merryweather on the 15-day injured list Tuesday due to right knee tendinitis, Taylor McGregor of Marquee Sports Network reports.

It's unclear when the injury first surfaced, but Merryweather surrendered four runs over one inning during his last appearance Sunday in Miami. The right-hander is without a clear timeline for his return but will be eligible to rejoin the active roster during the second week of September.

The Pirates designated Feigl for assignment Tuesday.

Pittsburgh selected Feigl's contract from Triple-A Indianapolis over the weekend, but it'll be a brief stay in the majors after he surrendered six runs over 1.2 frames in his big-league debut Monday. The left-hander should return to Indianapolis if he passes through waivers unclaimed.

The Phillies activated Covey (shoulder) from the 60-day injured list and outrighted him to Triple-A Lehigh Valley on Tuesday, Tim Kelly of Phillies Nation reports.

Covey has pitched well on his rehab assignment with Lehigh Valley, allowing just one run with a 9:3 K:BB over eight innings. However, the Phillies have elected to keep him there rather than add him to the major-league roster. Covey missed the first four months of the season with a shoulder strain.

The Pirates activated Mlodzinski (shoulder) from the 15-day injured list Tuesday, Noah Hiles of the Pittsburgh Post-Gazette reports.

Mlodzinski was sidelined for almost a month with a right shoulder strain but is ready to go after making three rehab appearances. The reliever holds a 3.14 ERA and 29:13 K:BB over 34 innings for the Bucs this season.