Sepp Blatter, the head of Fifa, is facing a criminal probe by Swiss prosecutors
The attorney general’s office said he was being investigated “on suspicion of criminal mismanagement as well as – alternatively – on suspicion of misappropriation”, BBC reported.
Mr Blatter was being questioned, and his office was searched, it added. Fifa said it was co-operating with the Swiss attorney general.
The Swiss attorney general’s office said the investigation surrounds a TV rights deal Mr Blatter signed with former Caribbean football chief Jack Warner in 2005.
Mr Blatter is also suspected of making a “disloyal payment” in 2011 to UEFA president Michel Platini, the statement said.
In May, seven Fifa officials were arrested in Zurich on corruption charges by US authorities.
Mr Blatter won a fifth consecutive Fifa presidential election on 29 May but, following claims of corruption, announced his decision to step down on 2 June.
He is due to leave the role at a Fifa extraordinary congress on 26 February.