The Detroit Tigers scratched catcher Alex Avila from Sunday's Game 4 lineup because of right forearm soreness.
He will be replaced by Gerald Laird.
Tigers manager Jim Leyland said Avila might be able to catch in an emergency, but probably could not be used as a pinch-hitter.
The team could make a roster move if the series continues beyond Sunday.
The Tigers are down three games to none in the best-of-seven World Series.