Bourjos was "sore" postgame, but said he had no idea how long the injury would keep him out.
"It grabbed pretty good the minute I hit the bag, so I knew I pulled it," said Bourjos, who hobbled back to the dugout and was replaced by J.B. Shuck. "Hopefully it's not that long. I don't know at this point."
Luis Jimenez also left the game early with a bruise on his left shin, which he suffered while getting hit by a throw on an eventual infield single in the fifth. Jimenez played three more innings, then came out of the game and Angels manager Mike Scioscia said postgame that he was "pretty stiff," likely keeping him out of the lineup for at least Tuesday's game.
Shortstop Erick Aybar, who went 2-for-5 with a homer and a double for Triple-A Salt Lake on Monday, is expected to be activated off the disabled list prior to Tuesday's game, thus taking Bourjos' roster spot. But after using seven relievers for 12 2/3 innings on Monday night, Scioscia said they "have a lot of things on our plate right now" with regards to potential roster moves.
Bourjos, who missed 11 games because of tightness in his right hamstring in July of 2011, was batting .405 in his past 11 games -- all of which came from the leadoff spot.
"It sucks any time you get hurt, but especially when you're swinging the bat well and feel good at the plate," Bourjos said. "You don't want to have anything keep you out of the lineup. This is pretty frustrating."
Alden Gonzalez is a reporter for MLB.com. Read his blog, Gonzo and "The Show", and follow him on Twitter @Alden_Gonzalez. This story was not subject to the approval of Major League Baseball or its clubs.