Wood (shoulder) hasn't resumed a throwing program since receiving a platelet-rich plasma injection during the second week of June, MLB.com reports.

Oakland transferred Wood (shoulder) to the 60-day injured list Sunday.

Wood (shoulder) is slated to begin playing catch this weekend, MLB.com reports.

The Athletics placed Wood (shoulder) on the 15-day injured list Wednesday with left rotator cuff tendinitis.

Wood has been sent back to Oakland to have his left shoulder evaluated, Martin Gallegos of MLB.com reports.

Athletics manager Mark Kotsay revealed that Wood was bothered by a shoulder injury during his start in Sunday's 8-4 loss to the Mariners, Martin Gallegos of MLB.com reports. "Alex has been grinding," Kotsay said. "He hasn't felt great. He's been able to make every start. But you saw a little drop in velo and his slider wasn't as sharp. He gave us everything he had for two innings."

Wood (1-3) took the loss Sunday against the Mariners, allowing five runs (one earned) on four hits and a walk while striking out a batter over two innings.

Wood did not factor into the decision Tuesday, allowing two runs on five hits and three walks while striking out two in a win over the Rangers. He struck out two.

Wood allowed an earned run on two hits, a walk and a wild pitch over three innings in a Cactus League win over the Reds on Friday. He struck out four.

The Athletics announced Tuesday that Wood will start Opening Day against the Guardians on March 28, Martin Gallegos of MLB.com reports.