BOSTON (CBS) – It’s been over a week since Andrew Bailey has pitched, and the Red Sox closer will undergo an MRI on Monday on what the team is calling a biceps strain.

Red Sox manager John Farrell said the injury is not too much of a concern, but a trip to the disabled list is still a possibility for Bailey.

“It’s in the last 10-percent of intensity that he’s going through. For our own information and his peace of mind, we’ve got to get that looked at thoroughly,” Farrell told reporters in Texas on Sunday.

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Bailey last pitched April 28 against the Houston Astros, so if he were to land on the DL it could be retroactive to April 29.

Bailey has handled the closer duties with ease since Joel Hanrahan was sidelined with a hamstring injury in early-April. In his 13 games as Boston’s closer, Bailey went 1-0 with a 1.46 ERA, converted five saves in six chances.

Hanrahan notched a save for Boston on Thursday in a 3-1 win over the Toronto Blue Jays.