Former AC Milan midfielder Gennaro Gattuso is being investigated for match-fixing, Associated Press reports.
Four other people have been detained in connection with the alleged fixing of matches in Serie A three seasons ago.
Ex-Rangers star Gattuso, 35, is retired and was sacked by Serie B side Palermo after just six league games as manager.
He won two Serie A titles and two Champions League crowns during his 13-year spell with Milan and also the 2006 World Cup with Italy in Germany.
