ANAHEIM -- Making his second start of the season in right field after recovering from a torn pectoral muscle in his chest, Angels slugger Vladimir Guerrero was forced to leave Tuesday night's game in the eighth inning with what was described as a strained muscle behind his left knee.
Guerrero pulled up as he was fielding Elvis Andrus' single with Texas leading, 6-4, en route to an 8-5 win. Walking off the field on his own power, Guerrero was replaced by Gary Matthews Jr.
"We're going to have to reevaluate it tomorrow," Angels manager Mike Scioscia said, adding that he doesn't expect to have Guerrero in the lineup in Wednesday's series finale. "He's been moving pretty well. He went to cut off the ball in the gap, and it grabbed him a little bit. It's a muscle, the upper calf.
"It's obviously a setback if he's not able to get back in the lineup quickly. Hopefully, we'll be able to absorb these nicks. How long it takes Vlad to heal, there's not a lot we can do about that at this point."
Guerrero, who had singled in four at-bats, was starting to show his power after a sluggish start, having homered in consecutive games against the Orioles. He's batting .290 with four homers and 21 RBIs.
Guerrero had right knee surgery in October and did not play in the field until late in the exhibition season. He suffered the torn pectoral muscle making a throw against the Dodgers on April 2, missing 35 games.
Lyle Spencer is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.