Texas Rangers setup man Mike Adams is out indefinitely, as he continues to deal with pain and tightness in his right trapezius muscle.
Adams was out Sept. 12-18 with a similar injury, and said it has not recovered fully. He had an MRI taken and is hopeful to be ready for the season-ending series at Oakland.
It was apparent on Thursday night when Adams gave up three solo home runs, which allowed the Oakland Athletics to pull within two runs of what had been a 9-4 game.
"I'm not 100 percent," Adams said. "If it would have been a two-run game yesterday, it would've cost us the game. I can't do that to my teammates."
Adams has not thrown a clean inning since Aug. 27, and has a 7.56 ERA over nine appearances this month.
Manager Ron Washington said that right-handers Koji Uehara and Alexi Ogando would become the primary setup men, and possibly left-hander Robbie Ross.
Here are a few other pregame notes:
* Yu Darvish threw a bullpen session Friday afternoon and came through it with no issues. He is scheduled to start against the Angels on Sunday, which would be his last regular-season start.
* Mike Olt is still not available off the bench, Ron Washington said. Olt has gone through all baseball activities, including running, but is not ready to play in a game yet.
* The Rangers can clinch a postseason berth with a victory tonight, guaranteeing them at least a spot as a wild card team. They have already clinched a share of the second wild card. However, the Rangers aren't expected to celebrate their postseason berth tonight. If they win the American League West, that's when they will celebrate.
-- Drew Davison