Garrett, a four-year veteran, is expected to return in November. The Timberwolves begin the season Nov. 5 against the Sacramento Kings in Japan.
"That definitely makes us thinner," coach Flip Saunders said Friday, the day Garrett had surgery.
Rookie Radoslav Nesterovic, a 7-footer who signed with Minnesota two games before the end of last season and has just 30 minutes of regular-season NBA experience, will replace Garrett in the starting lineup.
Trevor Winter, who played in one game for five minutes last season, will be the backup.
Saunders said he expects forward Tom Hammonds to miss three to five weeks with sore and swollen ankles from stress reactions in his heels. Sam Mitchell (knee) and Joe Smith (left foot) are also banged up.
"You'll see some funky lineups over the next three weeks, that's for sure," Saunders said.
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