The Boston Red Sox had a few moves to make to get the 40-man roster into compliance by Monday's deadline.

One move Boston made that didn't shock was designating righty Zack Kelly for assignment . He missed a chunk of the 2026 season due to injury. Plus, he only pitched in 17 games in the majors in general in 2026 as he spent time down in Triple-A. The Kelly move didn't shock. But what decision that did come as a surprise was Boston's decision to designate lefty Eduardo Rivera for assignment.

The Red Sox announced the news on X.

The #RedSox today announced the following roster moves: pic.twitter.com/V6VyBYyIcl

— Red Sox (@RedSox) November 3, 2026

The Red Sox Surprised

Jul 17, 2026; Boston, Massachusetts, USA; Boston Red Sox pitcher Eduardo Rivera (99) pitches during the first inning against the Tampa Bay Rays at Fenway Park. Mandatory Credit: Bob DeChiara-Imagn Images | IMAGN IMAGES via Reuters Connect

Rivera is just 23 years old and he made his big league debut in 2026 .…