Erceg was placed on the 15-day injured list Friday with a lower-back strain.

The most recent news was that Erceg was unavailable due to illness, but this back issue is likely the main reason he hasn't pitched since May 24. His IL placement is retroactive to May 27, so he could return June 12 against the Yankees if he misses the minimum amount of time.

The Orioles transferred Poteet (shoulder) from the 15-day injured list to the 60-day IL on Friday.

The right-hander has been on the shelf since late April due to shoulder inflammation, and he'll remain sidelined for at least a few more weeks. Poteet surrendered five runs over 2.2 frames in his lone outing for Baltimore before landing on the IL.

The White Sox placed Castro on the 15-day injured list Friday due to a torn patellar tendon in his right knee.

Castro suffered the injury during Wednesday's game against the Mets and is set to miss the rest of the season, and it's unclear if he'll be ready for the start of the 2026 campaign. The right-hander will likely be shifted to the 60-day IL once Chicago needs an opening on the 40-man roster.

Altavilla agreed to a one-year, $1 million contract with the White Sox on Friday.

The veteran right-hander was released from his minor-league contract with the White Sox last weekend, but he's now back with the club on a major-league deal. Altavilla pitched well for Triple-A Charlotte with a 2.49 ERA, 1.32 WHIP and 18:10 K:BB across 21.2 innings.

Shuster will work as the opener Friday in Baltimore, Scott Merkin of MLB.com reports.

The game got pushed up a few hours due to inclement weather, so Shuster is going to give primary pitcher Sean Burke more time to get ready. Shuster has been back and forth between Triple-A and the majors a couple times this month, and he has a 1.93 ERA, 1.71 WHIP and 3:2 K:BB in 4.2 innings over his three most recent appearances with the big club.

Castro is out for the season due to a right knee injury, Jesse Rogers of ESPN.com reports.

Castro injured his right knee as he slipped while trying to cover first base against the Mets on Wednesday. He had to be removed from the game as he was helped off the field by trainers, but the injury was initially tabbed as soreness. The specifics of the injury are yet to be disclosed, but he won't retake the mound for the White Sox in 2025.

Burr (shoulder) received a cortisone injection Thursday to help treat his right shoulder inflammation, Arden Zwelling of Sportsnet.ca reports.

Burr was pulled off his rehab assignment Monday after experiencing a setback in his recovery, and he'll now be shut down from throwing for a few days following the injection. A clearer return timeline for the right-hander may emerge once he gets the green light to start building back up.

The Mariners optioned Castano to Triple-A Tacoma on Thursday.

Castano joined the Mariners' bullpen after being called up May 23 and made his MLB debut May 28. It was the lone appearance he made as he allowed three earned runs on three hits and two walks across three innings of relief. As a corresponding move Thursday, Casey Lawrence was selected from Triple-A Tacoma

The Mariners selected Lawrence from Triple-A Tacoma on Thursday.

Lawrence was outrighted to Triple-A Tacoma on May 23 after losing his roster spot two days prior. He did not make any appearances for Tacoma after being sent down as his last appearance was May 20 for the Mariners against the White Sox. In that outing, the 37-year-old tossed five innings in which he allowed an earned run on six hits. In other moves Thursday, Seattle optioned Blas Castano to Triple-A Tacoma and designated Blake Hunt for assignment.

The Guardians claimed Krook off waivers from the Athletics on Thursday and optioned him to Triple-A Columbus, Tim Stebbins of MLB.com reports.

Krook was pushed off the Athletics' 40-man roster Tuesday after allowing two runs in 3.1 innings. He owns a 3.21 ERA in 14 Triple-A frames this season, however, and he'll now attempt to work his way back into the big leagues with Cleveland. Ben Lively (elbow) was transferred to the 60-day IL to make room for Krook on the 40-man.