Simpson, signed Thursday by the Islanders for the final week of the regular season, was suspended indefinitely after receiving a penalty for abuse of an official while playing in the Hannover Scorpions' last postseason game.
The International Ice Hockey told the NHL that the German league will hold a hearing Monday and asked that the suspension be upheld Saturday. The NHL honoured the request and said it will review the decision following the hearing and then determine Simpson's status in North America.
Simpson was held out of the Islanders' home game against Ottawa on Saturday night. New York has been short on defence due to injuries to Radek Martinek, Bruno Gervais, and Freddy Meyer.
Simpson became eligible to play Saturday after clearing waivers following the 10-year NHL veteran's season in Germany. Deron Quint, signed Friday, cleared waivers and made his debut with the Islanders against the Senators.
Quint, who spent three seasons playing in Europe after nine in the NHL, last played in the league for Chicago in 2003-'04 when he had four goals and seven assists in 51 games.
Neither defenceman would be eligible for the playoffs should the Islanders qualify.