The A's placed outfielder Josh Reddick on the 15-day disabled list with a sprained right wrist and designated reliever Pat Neshek for assignment, the team announced Monday.
First baseman Daric Barton was selected from Triple-A Sacramento to replace Reddick, and he will start Monday night's game against the Detroit Tigers while Brandon Moss moves to right field.
The A's also had pitchers Bartolo Colon and Brett Anderson join the team in Detroit. Colon is on the disabled list with a groin strain but is eligible to come off on Thursday. Anderson has been sidelined since May 1 with a stress fracture in his right foot.
Also, right-hander Evan Scribner was recalled from Sacramento to take Neshek's spot.
Reddick was batting .213 with 10 home runs and 46 RBIs in 97 games with the A's. He was batting .264 with five home runs over his last 15 games after hitting just five home runs over his first 82 contests.
Neshek was 2-1 with a 3.58 ERA and .265 opponents batting average in 41 relief appearances. He had a a.10 ERA over his first 29 games, but has a 6.75 ERA in 12 games since then. Neshek has appeared in just two of the A's past 15 games.
Barton joins the A's for the second time this year after hitting .143 with a home run and three RBIs in eight games during his first stint from May 8-17. He has spent the balance of the season at Sacramento where he is batting .297 with 29 doubles, seven home runs and 69 RBIs in 110 games. Barton leads the Pacific Coast League with 87 walks and ranks second with a .423 on-base percentage.
Scribner is in his fourth stint with the A's in 2013 and has no decisions and a 5.03 ERA in 13 relief appearances.