Rengifo will undergo additional testing on his injured biceps in the next few days, Doug Padilla of The Orange Country Register reports.
Rengifo was injured while taking a practice swing in the on-deck circle during Thursday's game, and he was subsequently diagnosed with a biceps injury. The utility man said Friday that he was feeling better, though he was wearing a brace on his left elbow, and Angels manager Phil Nevin stated that his prognosis "doesn't look great." The injury comes at a particularly unfortunate time for Rengifo, as he was in the midst of his best offensive stretch of the campaign, riding a 14-game hitting streak during which he slashed .446/.476/.804 with five homers, 14 RBI, nine runs and a stolen base.