Turkish police have detained a Fenerbahce director and three more suspects for interrogation in a growing match-fixing probe.

The police detained Murat Ozaydinli, a board member of the league champion Fenerbahce, along with another club official on Friday. The others arrested were a player of Istanbul Buyuksehir Belediyesi and an official of Genclerbirligi.

Prime Minister Recep Tayyip Erdogan, a Fenerbahce supporter, has extended full support to the crackdown on football corruption. Hurriyet newspaper quoted Erdogan as saying ''I regard this as a process of purification.''

More than 30 people, including Fenerbahce president Aziz Yildirim, have been charged in the probe that involves 19 games last season. Fenerbahce faces the threat of losing its title and relegation.