CHICAGO – The Boston Red Sox have placed right-hander Josh Beckett on the 15-day disabled list because of right shoulder inflammation.

Manager Bobby Valentine said before Saturday’s game against the Chicago Cubs that the Red Sox are “going to take the conservative route.”

“He’s got some inflammation that we’re going to calm down and take the time, whatever time it takes to do it,” Valentine said. “We thought in between starts was enough. He could have gotten an extra day or two, I guess.”

Valentine said he didn’t think the problem was related to a lat injury that caused Beckett to miss a start in the beginning of May. Beckett, 32, also has had a thumb issue all season which Valentine said the club may think about “dealing with” while he’s on the DL.

Beckett is 4-7 with a 4.14 ERA in 12 starts this year. He was scheduled to start today.

Valentine announced after Friday’s game that left-hander Franklin Morales will start in his place. Morales is 0-1 with a 3.04 ERA in 22 relief appearances.

The initial plan was for right-hander Clay Buchholz to pitch on short rest, but Buchholz felt he needed the extra days. He is scheduled to start Tuesday against Miami.

The Red Sox recalled right-handed reliever Clayton Mortensen from Triple-A Pawtucket. Mortensen appeared in three games for the Red Sox in early May, allowing six hits and one run in 91/3 innings. He struck out 12 with no walks.

Beckett’s injury is just another blow to the last-place Red Sox, who already had 10 players on the disabled list.