With Wilyer Abreu set to return from the injured list ahead of Friday's series opener against the San Francisco Giants, the Red Sox are sending one of their "big three" prospects to Triple-A.

Campbell’s return to the minors comes with right fielder Wilyer Abreu expected back Friday, when the Sox open a series against the Giants. He has been on the injured list with a strained left oblique but completed a two-game rehabilitation assignment with Worcester this week.

The Boston Red Sox are sending infielder Kristian Campbell to Triple-A, sources told ESPN's Jeff Passan on Thursday. Campbell, who signed an eight-year, $60 million contract this spring, was hitting .