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07/08/09 9:20 PM ET

Vlad still waiting for prognosis on knee

Angels slugger remains out following Tuesday's injury

ANAHEIM -- A day after straining a muscle behind his left knee against the Texas Rangers, Vladimir Guerrero is still waiting on the results of an MRI exam.

Guerrero came up favoring his left knee after attempting to get an angle on an Elvis Andrus single to right field in the top of the eighth inning in Texas' eventual 8-5 win. For Guerrero, it was only his second start in the field this season.

"He is sore today, and we will reevaluate this thing and how it sets up in the next day or two," Angels manager Mike Scioscia said. "We will wait for some direction from Dr. [Lewis] Yocum on what the time frame might be."

After tests, it became clear that Guerrero's injury was muscle related and not a problem with the joint.

"There are a lot of things with tendons and muscles that can set you back and a wide range of things that can happen," said Scisocia, "however it not being in the knee joint is right now mildly reassuring."

Guerrero had surgery on his right knee in October, missing most of the exhibition season. He also suffered a torn right pectoral muscle April 5 against the Dodgers and missed 35 games.

Guerrero has been heating up lately, acting mostly as the designated hitter since he came of the disabled list on May 25. In a recent series against the Orioles, Guerrero hit home runs in consecutive games to go along with seven RBIs.

Before the Orioles set, Guerrero was struggling at the plate, hitting .289 with only two home runs and 13 RBIs in 40 games.

Quinn Roberts is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.