SEATTLE - Shortstop Marcus Semien was added to the A's 25-man roster Thursday after being sidelined nearly three months by a fractured wrist.
He takes the spot of starting pitcher Jharel Cotton, who was placed on the 10-day disabled list with the blister that he's been dealing with on his right thumb. To clear a spot on the 40-man roster for Semien, right-hander Andrew Triggs was transferred to the 60-day DL with the torn labrum in his left hip.
The upshot of this roster shuffle is that Franklin Barreto, Oakland's top prospect who has been handling shortstop lately, stays up with the big league club for now. Manager Bob Melvin had indicated Barreto was a candidate to return to the minors when Semien was activated.
It remains to be seen how the A's handle their middle infield situation as they begin a four-game series at Safeco Field against the Mariners on Thursday night. Second baseman Jed Lowrie is a heavily rumored candidate to be dealt as the July 31 non-waiver trade deadline approaches.
Cotton's next turn in the rotation comes Saturday, so the A's will have to identify a starter for that day.
Semien underwent surgery April 18 to have a screw inserted the fractured scaphoid bone in his wrist.