"It's very mild," Angels manager Mike Sciosica said of the strain, "but something we're going to give a couple days to get to a better level. Vernon's played a lot of left field with [Peter] Bourjos in center. [Wells] has played a lot with Bobby [Abreu] and Torii [Hunter] on the wings.
"There's not a lot we're going to accomplish pushing this [with Wells]. He's going to play [Sunday]. Right now, he's got enough at-bats to be ready to start the season."
Wells said he would put a wrap on it and continue to play if it had happened in the regular season.
"You play through things like this all the time," he said.
Wells hit .279 in the Cactus League with a .419 slugging percentage and has handled the transition to left field smoothly after spending his entire 12-year career in Toronto in center. He had 31 homers and 88 RBIs last year for the Jays, batting .273 while committing no errors in 157 games.