Manager Brandon Hyde announced Friday that Kittredge will undergo arthroscopic surgery on the cartilage in his left knee and is expected to be sidelined for multiple months, Jake Rill of MLB.com reports.

Kittredge was pulled from Grapefruit League action after experiencing soreness in his left knee prior to this past Saturday's game against the Pirates. The 34-year-old right-hander underwent an MRI on his knee and opted to undergo surgery after receiving multiple opinions. With Kittredge set to start the 2025 regular season on the IL, Gregory Soto, Yennier Cano and Cionel Perez are expected to take on larger roles in the bullpen alongside Seranthony Dominguez and Felix Bautista.

The Mariners reassigned Fleming to minor-league camp Friday.

Fleming logged a 4.02 ERA and 1.53 WHIP over 31.1 innings with the Pirates last year before being released and finishing the season in Seattle's farm system. He tossed three scoreless innings over his three appearances this spring but will ultimately miss out on the Mariners' Opening Day bullpen.

The Mariners optioned Danner to Triple-A Tacoma on Friday, Shannon Drayer of SeattleSports.com reports.

The Mariners claimed Danner off waivers early January after the 26-year-old right hander was DFA'd by the Blue Jays in December. He spent most of the 2024 regular season with Triple-A Buffalo, where he posted a 3.15 ERA, 1.32 WHIP and seven saves across 34.1 innings. Danner will begin the 2025 campaign with Triple-A Tacoma, though he could see some time in the majors if the Mariners are in need of depth out of the bullpen.

Yankees manager Aaron Boone said Friday that Hamilton is close to his Grapefruit League debut after being sidelined by an infection, Bryan Hoch of MLB.com reports.

It's not clear when or how the issue cropped up, but it was enough to shelve Hamilton for the first half of camp. Since he's a reliever, he could still have time to ramp up for Opening Day. Hamilton has had a tough time staying healthy but has been effective for the Yankees when on the bump, sporting a 3.10 ERA and 110:40 K:BB over 95.2 regular-season innings across two campaigns.

Swanson (forearm) is expected to begin the season on the injured list after he experienced right elbow discomfort after a bullpen session this week, Arden Zwelling of Sportsnet.ca reports.

The Blue Jays are awaiting the results of an MRI, which could provide some clarity on how long the 31-year-old will be sidelined. After operating as a reliable high-leverage reliever from 2021 to 2023, Swanson struggled to a 5.03 ERA across 45 appearances last season.

Yankees manager Aaron Boone said Friday that Matzek (oblique) has a "pretty good strain" and will be sidelined a few weeks, Greg Joyce of the New York Post reports.

Matzek hasn't appeared in a Grapefruit League game since Feb. 25 due to an oblique strain. The good news is Boone noted that Matzek is now asymptomatic and could resume a throwing program Monday. The lefty reliever had been in line to make the team as a non-roster invitee, but he now won't be ready for Opening Day.

Dubin (shoulder) will resume playing catch Saturday, Brian McTaggart of MLB.com reports.

Dubin has been out all spring with right shoulder inflammation but is finally ready to begin a throwing progression. He will not be ready in time for Opening Day, however.

Loaisiga (elbow) has been throwing off a mound since at least March 4, per MLB.com.

Loaisiga is working his way back from the internal brace procedure he underwent last April. The righty reliever isn't going to be ready for the start of the regular season, but he could rejoin the Yankees' bullpen around early May. Loaisiga may be able to work his way up to a high-leverage role once he's back in action.

Ort (oblique) has progressed to flat-ground throwing, Brian McTaggart of MLB.com reports.

Ort tweaked his left oblique early in camp but has made progress of late. However, given that he's not throwing off a mound yet, his availability for Opening Day would appear to be in question.

Beeter (shoulder) is not expected to be ready in time for Opening Day, Chris Kirschner of The Athletic reports.

Beeter has not appeared in a Grapefruit League game because of a right shoulder problem. He had been throwing off a mound, but it's not clear whether he might have suffered a setback. Beeter has been converted to reliever and could work his way into an important role in the Yankees' bullpen, once healthy.