Jimenez is expected to mis the next 8-to-12 months while recovering from surgery to repair damaged cartilage in his left knee, Mark Bowman of MLB.com reports.

This news came out of the blue for Jimenez, who was one of Atlanta's top relievers during the 2024 campaign. A timeline for his return should come into focus as he begins to progress in his rehab, but it appears he'll be sidelined for the first half of the 2025 season if not longer.

Simpson cleared waivers and was outrighted off the Marlins' 40-man roster Monday.

A 27-year-old southpaw, Simpson had surgery in April to repair the ulnar nerve in his left elbow and was able to return late in the year with a rehab assignment before being assinged to Triple-A. Simpson logged a 7.62 ERA, 1.77 WHIP and a 19:7 K:BB in his final 13 innings last season and has never reached the big leagues.

The Cubs designated Herget for assignment Monday, Maddie Lee of the Chicago Sun-Times reports.

The move clears a spot on the 40-man roster for Rob Zastryzny, who was claimed off waivers. Herget himself was a waiver claim of the Cubs but never made an appearance for them.

The Cubs claimed Zastryzny (elbow) off waivers from the Brewers on Monday, Maddie Lee of the Chicago Sun-Times reports.

It's a return to his original organization for Zastryzny, who was drafted by the Cubs and spent his first three major-league seasons in Chicago. The lefty reliever ended the season on the injured list with elbow tendinitis but looks to be healthy headed into the offseason.

The Phillies claimed McMillon (elbow) off waivers from the Marlins on Monday.

McMillon ended the 2024 season on the injured list with an elbow injury, but the Phillies are evidently comfortable with his health situation. The right-handed reliever holds a 1.69 ERA and 21:5 K:BB over 16 innings during parts of two seasons at the major-league level.

The Pirates outrighted Mattson to Triple-A Indianapolis on Monday, Andrew Destin of the Pittsburgh Post-Gazette reports.

Mattson is no longer on the 40-man roster but will stick around in the organization. He allowed three runs over 5.1 relief innings for the Pirates this season.

The Pirates outrighted Jefferies to Triple-A Indianapolis on Monday, Andrew Destin of the Pittsburgh Post-Gazette reports.

Jefferies has been outrighted previously, so he could elect free agency if he wants. The right-hander ended the season on the 60-day injured list with an elbow injury, but he had been making rehab starts so he should be healthy heading into the offseason.

The Pirates outrighted Heller (shoulder) to Triple-A Indianapolis on Monday, Andrew Destin of the Pittsburgh Post-Gazette reports.

Heller ended the season on the 60-day injured list with a shoulder issue. He's off the 60-day IL but will not return to the 40-man roster. It's not clear how healthy his shoulder is now.

The Phillies outrighted Tarnok to Triple-A Lehigh Valley on Monday, Matt Gelb of The Athletic reports.

Tarnok has been removed from the 40-man roster but will stick around in the organization for now. The righty was a waiver claim of the Phillies back in July.

The Phillies outrighted Ortiz (elbow) to Triple-A Lehigh Valley on Monday, Matt Gelb of The Athletic reports.

Ortiz had Tommy John surgery in July and will miss most, if not all, of the 2025 season. He'll remain in the organization to rehab the injury but is no longer on the 40-man roster.