In need of a fresh arm for Tuesday night following their 14-inning marathon Monday, the Red Sox made a roster move involving their bullpen -- and they're not done yet with shuffling pitchers in and out.

Clayton Mortensen was placed on the 15-day DL with a right hip impingement and the Sox called up Jose de la Torre to take his spot.

"Clayton has been dealing with a hip and groin issue since we left spring training," said John Farrell. "As much as we wanted to get him for multiple innings (Monday) night, he couldn't go after the one inning he worked. So that's the move to get de la Torre here."

"It's been nagging me for quite some time," said Mortensen. "The first time I felt it was the Baltimore series at home (in the second week of April), so I've been grinding with it a little while. It comes to a point where, OK, it's affecting the way I'm throwing and I'm not able to execute pitches I want to execute, I've got to make a move, get it right and give me some time to get it back to feeling normal again."

Mortensen said he had difficulty finishing pitches because of the hip soreness.

"It's my push-off leg," explained Mortensen, "so when I try to drive to home plate, sometimes it just doesn't want to fire. It will lock up a little bit and so when I get out to my release point, it's almost like a guessing game sometimes. And it's not fun to play a guessing game when you're facing American League East hitters.

As a result, his command suffers and the quality of the stuff is impacted.

"You can't put the normal spin on it you normally do," said Mortensen. "Balls tends to be up in the zone, don't move as much, guys hit the ball harder, whatever."