The Baltimore Orioles placed third baseman Manny Machado on the 15-day disabled list due to a right knee sprain, the team announced Wednesday.
The move is retroactive to Aug. 12.
Machado, who underwent surgery on his left knee after suffering a torn medial patellofemoral ligament in the final days of the 2013 season, had his right knee collapse under him on a swing as he hit a broken-bat grounder in the third inning of Monday's 11-3 victory over the New York Yankees.
Machado was helped off the field by manager Buck Showalter. Machado had an MRI on the knee the following day, which confirmed the sprain.
Machado, 22, has batted .278 with 12 home runs and 32 RBIs in 82 games for the Orioles this season.
The Orioles recalled infielder Cord Phelps from Triple-A Norfolk.
Phelps, 27, has batted .258 with 23 extra-base hits and 49 RBIs in 97 games for Norfolk. Originally a third-round pick by the Cleveland Indians in 2008, Phelps is a lifetime .280 hitter in seven minor league seasons. He has played in 53 major league games since making his debut for Cleveland in 2011. He has a .159 career batting average in 113 at-bats over three seasons with the Indians.
To make room for Phelps on the 40-man roster, catcher Matt Wieters has been transferred to the 60-day disabled list.
Wieters, 28, was placed on the 15-day DL on May 11 with a right elbow strain and had Tommy John surgery on June 17.