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SAN DIEGO (AP) _ Right-hander Darren Dreifort was placed on the 15-day disabled list Saturday by the Los Angeles Dodgers with a sprained ligament in his right shoulder.

Dreifort is scheduled to undergo an MRI exam on Tuesday in Los Angeles. There's concern about this injury because he sprained the same ligament that was repaired during reconstructive surgery March 14, 1995. That surgery sidelined him for the entire season.

Dreifort left Friday night's game after striking out Ben Davis leading off the sixth inning. The Dodgers noticed a drop in the velocity of his pitches.

Dreifort, who signed a $55 million, five-year contract in the offseason, is 4-7 with a 5.13 ERA.

To replaced Dreifort on the roster, the Dodgers activated infielder Tim Bogar from the disabled list. Bogar had been out since June 14 with a strained right hamstring.

The Dodgers likely will recall Eric Gagne from Triple-A Las Vegas to make Dreifort's next scheduled start on Wednesday against San Francisco.