The Rangers placed Loe on the 15-day disabled list, retroactive to July 29, with tightness in his lower back. The injury occurred during Loe's bullpen session on Wednesday in Cleveland.
"It was towards the end of my bullpen," Loe said. "I felt my back getting a little tight, and threw one more pitch, and it just locked up on me."
Loe has had lingering back issues in the past but never severe enough to force him to miss a start.
"Being a tall guy I have lower back issues every once in awhile," said the 6-foot-7 Loe. "I've battled through this kind of stuff before. ... It usually clears up in two or three days but this one is going to take a little bit longer. Better play it safe than sorry. I'd hate to go out there and get injured in the first or second inning after trying to rush it back."
Now that Loe has landed on the DL he will have miss at least two starts. He says he's already starting to feel a lot better and his back has progressed to the point that he may be able to throw off flat ground prior to Saturday's game against the Jays.
"It's still a little uncomfortable," Loe said. "But it's gotten so much better from yesterday, to today, that tomorrow I think I'll be able to throw and get a bullpen or two in between [starts]."
Right-hander Mike Wood has been recalled from Triple-A Oklahoma to make Saturday's start. Wood made four starts for the Rangers earlier this season, going 1-1 with a 5.49 ERA. While pitching for Oklahoma, Wood went 9-3 with a 3.23 ERA in 16 games.
The biggest question surrounding Wood's outing on Saturday is how many pitches he will be allowed to throw. He's forced to take the mound on just two days rest after he threw 81 pitches in a start on Wednesday. Wood picked up the win for Oklahoma in that outing, after allowing three runs on five hits over eight innings of work.
The Rangers have not yet decided whether Wood will make both starts during Loe's absence or if they will go in a different direction following Saturday's afternoon affair.
Gregor Chisholm is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.