After playing on the turf at the home of the Blue Jays, De Aza developed a stiff back. He was lifted for a pinch-hitter in the eighth inning of Friday night's game against the Royals when the back began to cramp and wasn't in the lineup on Saturday. Dewayne Wise drew the start in center field.
Manager Robin Ventura will likely keep De Aza out of the lineup on Sunday as well.
"Dewayne has filled in great," Ventura said. "We'll probably give [De Aza] a couple of days."
De Aza had started 107 games in center field through Friday.