Chris Cotillo of MassLive.com reports that the Red Sox are calling up LHP prospect Eduardo Rivera.

Yes, Rivera is a starting pitching prospect, but all signs are that he will not be filling Sonny Gray’s (hamstring) spot in the rotation, but instead will be used for length out of the bullpen. The Red Sox bullpen has been taxed early in the week, with Gray getting hurt and Connelly Early failing to complete six innings on Tuesday. Rivera should be able to throw multiple innings in one of the games against the Yankees before the Red Sox need a starter in Gray’s spot over the weekend. Rivera is just 22 years old but was somehow cut by the Athletics midway through the 2024 season. Last season for Boston, he posted a 2.48 ERA, 1.16 WHIP, and 108/46 K/BB ratio in 87 innings split between High-A and Double-A. He was off to a strong start in two appearances for Double-A this season and will likely join the Red Sox rotation in Triple-A after this brief call-up.