Antawn Jamison's ailing shoulder will take much longer to heal than expected, keeping him off the court well into the regular season.

The Washington Wizards revised their estimated recovery time for Jamison's injury Friday, announcing he's likely miss eight to 13 games in the regular season.

The two-time All-Star forward partially dislocated his shoulder trying to block a shot in an exhibition game against Cleveland October 14. The Wizards originally ruled him out for the rest of the preseason. But team president Ernie Grunfeld said Friday that the Jamison is expected be out three to five weeks.

The Wizards open their regular season in Dallas Tuesday.