White Sox slugger Frank Thomas will undergo season-ending surgery on his injured right ankle Monday.

The decision was made Thursday after consultation with Thomas, team podiatrist Lowell Scott Weil, White Sox GM Ron Schueler and trainer Herm Schneider.

Thomas was not at the ballpark yesterday to comment.

"We decided it was in everyone's best interest to go ahead and move Frank's surgery up instead of waiting until after the season ended," Schueler said.

During the surgery, Weil will remove a bone spur from Thomas's ankle and the corn from his small toe, and perform several other minor podiatric procedures.

Thomas, 31, finished with a .305 average, 15 home runs and 77 RBI. It is the first time he has not driven in 100 RBI or hit at least 20 home runs since 1990, his first full season in the majors.

WRIGHT BACK: Indians starter Jaret Wright, injured twice this season with a strained muscle in his upper back, was activated from the 15-day disabled list.

The right-hander has made only two starts in the past seven weeks between two trips to the disabled list with the back injury. He gave up no runs and only three hits over eight innings in two minor league rehabilitation starts this month.

Wright, who is expected to start Sunday at Chicago, is 7-7 with a 5.94 ERA in 21 starts.

Cleveland also activated rookie RHP David Riske and LHP Mark Langston from the 15-day disabled list. Riske had been out with a strained left oblique muscle since Aug. 31. The 22-year-old was 1-0 with a 12.27 ERA in six relief appearances. Langston was 1-2 with a 5.34 ERA in 22 games, including five starts.. . . The Indians recalled IF-OF Jolbert Cabrera, IF John McDonald and LHP Tom Martin from Class AAA Buffalo. Cabrera, McDonald and Martin have all had at least two stints with Cleveland this season.