ST. PETERSBURG -- The Indians are going to be without the services of leadoff hitter and shortstop Asdrubal Cabrera for quite a while.

Cabrera suffered a fractured left forearm in a collision with teammate Jhonny Peralta in the first inning of Monday night's 4-3 loss to the Rays and was placed on the 15-day disabled list on Tuesday. The Indians promoted prospect Jason Donald from Triple-A Columbus to replace Cabrera on the active roster. Donald was in the Indians' starting lineup at shortstop for their series finale against the Rays, batting ninth.

An immediate prognosis for Cabrera's return was not available, as he will visit a team doctor to determine if surgery is necessary. But given the injury, it's safe to assume he will miss at least six weeks, perhaps more. Head athletic trainer Lonnie Soloff will update reporters on Cabrera's condition and outlook for recovery Tuesday.

With a man on first, one out and Hank Blalock at the plate, the Indians employed the infield shift. Cabrera was right of the second-base bag and Peralta was at the shortstop position. Blalock sent a grounder up the middle, and Cabrera made a diving stop of the ball. But Peralta tumbled over Cabrera, causing the injury. Cabrera lay on the ground, writhing in pain for several minutes as he was tended to by trainers from both teams. His arm was placed in a wrap, and he was carted off the field.

After the game, Cabrera did not make himself available to reporters. He walked out of the Tribe clubhouse with his arm in a cast.

Cabrera recently returned to the lineup after missing several days with left quadriceps soreness. He is batting .287 with a homer and seven RBIs in 33 games this season. Luis Valbuena replaced him in the lineup after Monday's injury.

Donald, one of four players acquired in the trade that sent Cliff Lee and Ben Francisco to the Phillies last summer, will get his first crack at the big leagues. Playing primarily second base for the Clippers, he was batting .281 with an .827 OPS, two homers, 10 doubles and two triples through 36 games. He is a natural shortstop who was playing second base in case the Indians made a move with Valbuena.