Morales, who is hitting .290 with 11 homers and 39 RBI, socked a walk-off, game-winning grand slam against the Seattle Mariners Saturday, and as he leaped into a throng of celebrating teammates at home plate, he landed awkwardly and remained on the ground.
Morales was fitted with an air cast, carried off the field on a stretcher, and taken to a hospital, where X-rays revealed a fracture of his lower left leg.
He has been placed on the disabled list. The team said foot and ankle specialist Dr. Phil Kwong of the Kerlan Jobe Clinic was scheduled to perform surgery Sunday but orthopedist Dr. Lewis Yocum said the operation has been put off to allow swelling to subside, the Los Angeles Times reported.
No timetable has been set for Morales' return, but Slocum said September was not "out of the question."
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