Former AEK midfielder Vassilis Tsiartas stunned his former team yesterday by asking for the forfeiture of a letter of guarantee allowing it to take part in the Greek League Championship, so that he can recover part of the 1.24 million euros the club owes him. Tsiartas filed his petition yesterday with the Professional Sports Commission, the agency responsible for determining whether professional soccer or basketball clubs have the financial means to compete in their respective leagues. Athens soccer club AEK has deposited a letter of guarantee worth 750,000 euros with the commission. Tsiartas, now playing for German club Koln, was one of several AEK players who left after last season, when new management took over the debt-saddled club. Both departing and remaining players were asked to settle for less than they were owed. Tsiartas was among the few who refused.