A corresponding move will be made by the White Sox prior to Sunday's series finale.
"De Los Santos was up here to give us some insurance," White Sox manager Robin Ventura said. "It will be a [position] player. We are a little short players."
That new bench player figures to be Moises Sierra, as the White Sox also claimed the 25-year-old outfielder off of waivers from Toronto Saturday. Sierra was designated for assignment by the Blue Jays on May 1 after going 2-for-34 (.059) with two RBIs and two runs scored over 13 games this season. The 6-foot-1, 220-pound Sierra batted .290 in 107 at-bats with 13 doubles, a triple, home run, 13 RBIs and 11 runs scored over 35 games in '13. He hit .315 (23-for-73) with 10 RBIs vs. right-handers and .429 (9-for-21) with runners in scoring position.
Sierra also hit .317 (26-for-82) with 12 doubles, a homer and 11 RBIs over 25 games in September last season. He ranked among the American League September leaders in doubles (third), extra-base hits (tied for fourth, 14), slugging percentage (eighth, .524) and on-base percentage (ninth, .385). He has appeared in 74 games (66 starts) in right field and four (three starts) in left over his career.
Infielder/outfielder Leury Garcia, backup catcher Adrian Nieto and first baseman Paul Konerko represented the White Sox bench for Saturday's contest.
Scott Merkin is a reporter for MLB.com. Read his blog, Merk's Works, and follow him on Twitter @scottmerkin. This story was not subject to the approval of Major League Baseball or its clubs.