WALTHAM, Mass. -- Boston Celtics center Shaquille O'Neal received a cortisone shot in his ailing right foot Tuesday and was placed back in an immobilizing boot, sources told ESPN Boston. The objective with the boot is to eliminate the return of swelling after his Achilles injury flared up again recently while he was trying to work his way back to game action, according to the sources. The Celtics remain optimistic that O'Neal, who has been sidelined with the injury since Feb. 1, could return next week.

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