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Oakland Athletics' Brandon Inge watches his RBI single against the Chicago White Sox during the eighth inning of a baseball game in Chicago, Saturday, Aug. 11, 2012. (AP Photo/Nam Y. Huh)

KANSAS CITY, Mo. -- The A's placed third baseman Brandon Inge on the 15 day disabled list with a sprained right shoulder and recalled Josh Donaldson from Triple-A Sacramento.

Inge flew back to the Bay Area on Monday to get an MRI after he popped his shoulder out of its socket during Saturday's game in Chicago. It's unknown how long he will be sidelined.

Donaldson made the A's opening day roster but struggled offensively while seeing regular time at third. He's hit .335 with 13 home runs and 45 RBIs in 51 games with Sacramento.

He and Adam Rosales are the A's primary options for third base as the roster stands.

Inge's injury is no small loss for a team that enters Tuesday's series opener at Kansas City ranked 13th out of 14 American League teams in runs.

Though Inge is hitting just .216, he ranks third on the team with 52 RBIs. He's also been one of the team's best hitters in the clutch, batting .325 with runners in scoring position.

The A's had a shortstop on their wish list leading up to the July 31 non-waiver trade deadline. Depending on the seriousness of Inge's injury, they could try searching for a third baseman, either via a waiver trade or by signing a free agent.