Trout, who is 15 for 33 with three home runs and 10 runs batted in over his last nine games, raising his average from .263 to .294, was originally scheduled to start at designated hitter.
But about two hours before the game, as the Angels were preparing for batting practice, Trout was removed from the lineup and replaced by C.J. Cron.
“It just came on today,” Manager
Trout sat out his first game of the season on May 21 because of some tightness in his left hamstring, but when he started the next eight games in center field, he appeared to have fully recovered from that injury.
Scioscia said Trout did not seem to tweak the back in any way during Friday night's game. Scioscia was unsure of the severity of the issue, but it seemed doubtful Trout would be available off the bench Saturday night.