San Antonio, TX -- (Sports Network) - The San Antonio Spurs suffered a crushing blow on Monday, learning that they will be without guard Manu Ginobili for the remainder of the regular season as well as the playoffs.

Ginobili felt stiffness in his lower right leg during Sunday's loss to Cleveland. He underwent a CT scan and an MRI on Monday, which revealed an increased marrow edema and a stress fracture in his right distal fibula.

There is no timetable on how long the NBA's reigning Sixth Man of the Year will be out of action.

Ginobili missed the first 12 games of the 2008-09 season following offseason surgery on his left heel, and was on the sidelines for 19 games between February and March with a right ankle injury. Sunday was the Argentine's sixth game back from his latest setback.

For the season, Ginobili averaged 15.5 points, 4.5 rebounds and 3.6 assists in 44 contests for the Spurs, who currently hold the top spot in the Southwest Division and the No. 3 seed in the Western Conference, a half-game ahead of the Houston Rockets.