Lucas Giolito, signed by the Red Sox to anchor the rotation, may miss all of 2024:

Giolito, who was expected to be the Red Sox’s Opening Day starter, has a partially torn ulnar collateral ligament and flexor strain that could require surgery that would likely keep him out for the entirety of 2024, according to sources.

Giolito, 29, was one of just three free agent signings by the Red Sox over the winter, alongside reliever Liam Hendriks — who is expected to miss most, if not all, of 2024 after undergoing Tommy John surgery — and right-hander Cooper Criswell. While Red Sox chairman Tom Werner had suggested at the outset of the winter that the team would take a “full throttle” approach to free agency, Giolito’s two-year, $38.5 million contract represented more than three-quarters of their $49.5 million outlay, which ranks 13th in Major League Baseball.

ESPN.com

The Red Sox need a pretty good plan B now that their ace will likely miss significant time. This injury puts more pressure on the offense to be outstanding.