Good news - looks like Celts may get 50% of salary as long as Nov 30 date is extended considering lock-out started season late.
DISABLED PLAYER EXCEPTION -- This exception allows a team which is over the cap to acquire a replacement for a disabled player who will be out for the remainder of that season (if the player is disabled between July 1 and November 30) or the following season (if the player is disabled after November 30). This exception can also be granted in the event of a player's death. This exception can only be used to acquire one player. The maximum salary for the replacement player is 50% of the injured player's salary, or the average salary, whichever is less (see question number 25 for the definition of "average salary"). Approval from the league (based on a determination by an NBA-designated physician) is required for this exception to be used. This exception can be used to sign a free agent, or to create room to accept a salary in trade. When used for trade, the team may acquire a player whose salary (including any trade bonus) is up to 100% of this exception plus $100,000 (not 125%).