"He's all set for Tuesday," manager Terry Francona said, according to the Cleveland Plain Dealer.
Masterson, who was shut down for two days before the bullpen session, saw the time to rest as a benefit.
"The benefit of having those two days is that you know you have two days that you can spend just crushing the knee as far as therapy, movement, icing and stimulation," Masterson said, according to cleveland.com. "It seems like two days is a short amount of time, but it really gives you an opportunity to do a lot of things with the knee."
Zach McAllister was added to the rotation in Masterson's absence.
Masterson will face off against Josh Beckett in Tuesday's start. Masterson is 4-5 this season with a 5.03 ERA.