Red Sox center fielder Rusney Castillo has been diagnosed with a strained left oblique after a swing he took on Wednesday in an at-bat against Boston College, and will be out “more than a week,” according to manager John Farrell.

“He’s going to be down for some time,” said Farrell. “I don’t have a time frame to give you or a projected length, but he’s going through some treatment to try to calm down the strain right now, and then there will be rotational exercises and rehab when he’s ready for that.”

“It wasn’t any sort of different kind of swing or odd kind of swing,” Castillo said through interpreter Adrian Lorenzo. “It was just a pitch that was a little in, and I took a regular swing on it and just felt something there, right in the oblique area.”

Castillo said he has never had an oblique injury before and hopes he will be back for Opening Day, which is April 6 at Philadelphia.

“I don’t think it impacts me in a negative way,” said Castillo. “We’re doing everything we can to recuperate as quickly as possible, and I guess we’ll see how it goes.”

In Castillo’s absence, Mookie Betts and Jackie Bradley Jr. will get the reps in center field, according to Farrell. A prolonged absence for Castillo could affect Shane Victorino, who would see a lot of trade talk around him die down, and Bradley, who could make the team as a reserve.

Castillo, 27, signed with the Red Sox as a free agent last summer, receiving a seven-year, $72.5 million deal. He batted .333 in 10 games in September.

Bradley will make the start in center for Thursday’s Grapefruit League opener against the Twins and Betts will likely get the nod on Friday at home against the Marlins.

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