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08/23/11 5:50 PM ET

Brantley to remain out until at least Friday

CLEVELAND -- Michael Brantley's sore right wrist isn't improving, and it'll cost him more time away from the diamond.

The Indians outfielder missed the opening game of Tuesday's twin bill against the Mariners, and manager Manny Acta said he'll remain sidelined until at least Friday. The Tribe has an off-day on Thursday. By the end of the week, the Indians hope to have a sense of whether Brantley will need a stint on the 15-day disabled list.

"If our medical staff thinks he makes enough progress by then," Acta said, "maybe he can wait a couple more days, but it's not make or break."

Brantley's wrist has already cost him five games this month. Acta said it has hampered his ability to swing the bat freely. It flared up so badly during Monday's 3-2 loss to Seattle that Acta was planning to pinch-hit for Brantley if he was scheduled to hit in the ninth inning.

"He couldn't swing the bat at all," Acta said. "He couldn't grip the bat. He was just going to play defense up until his at-bat came up, and then we were going to pinch-hit. Unfortunately, he's not getting any better."

Brantley is hitting .266 with seven home runs and 46 RBIs in 114 games this season.

Zack Meisel is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.