Colas is not in the starting lineup for the White Sox's series opener against the Mariners on Monday.
Colas will begin Monday's game in the dugout after starting in each of the last three games. He went 3-for-11 with two RBI in the four-game series against the Red Sox. The lefty-hitting Zach DeLoach will start in right field and bat eighth against Seattle right-hander Logan Gilbert.