HOUSTON -- Rangers reliever Mike Adams most likely won't be available for Saturday's game against the Astros because he's still recovering from a respiratory infection.

Adams said he went to an urgent care clinic Friday afternoon to get a X-ray and CAT Scan on his chest. Adams also got some blood work.

"Hard to recover right now," Adams said.

Adams didn't get to the ballpark Friday night until 30 minutes before first pitch. He was three hours early Saturday but wasn't sure if he could pitch.

With Adams out, it makes for some interesting decisions in the bullpen.

Closer Joe Nathan appears out for Saturday after pitching four consecutive days. He's never pitched in five consecutive days. Normally, Adams would take over the closer role, but with his status uncertain, it appears Koji Uehara might get some significant late-inning relief work.

Manager Ron Washington said he heard Uehara was hoping to get some late-inning work, but it hasn't happened given the success of how Washington uses the bullpen.

Alexi Ogando, Adams and Nathan are the late-inning specialists. But with Adams and Nathan out, Ogando might become the closer. Robbie Ross, who pitched 2 1/3 innings Friday night, could be available for one or maybe two batters Saturday.