The former general manager of Italian football team Juventus is being quizzed by prosecutors investigating claims of match-fixing in Italian football.
Luciano Moggi says he feels drained by the accusations
Luciano Moggi resigned on Sunday after Juventus clinched the Italian championship.
It follows the release of taped telephone conversations involving Mr Moggi and football federation officials regarding refereeing appointments.
The claims have already led to the resignations of the Juventus board.
The head of the Italian Football Federation also resigned after transcripts of the phone taps, authorised by investigating magistrates, suggested Mr Moggi tried to influence the choice of referees for Juventus games.
The scandal prompted Italy to withdraw one of its two referees, Massimo de Santis, from next month's World Cup in Germany.
Before being interviewed by prosecutors, Mr Moggi said he felt completely drained by the claims made against him.
"Do not ask me any questions, because I have neither the will nor the strength. I have no soul left, they killed it," he told Rai Radio 1.
"Football is no longer my world and I will only think about defending myself from the much evil that has been said and done."
Outgoing Prime Minister Silvio Berlusconi, who owns rival AC Milan, has demanded that his club be awarded the previous two Italian championships, as they came second behind Turin club Juventus on both occasions.
Call for calm
But Juventus coach Fabio Capello says the situation called for calm and serenity, and said no decisions should be made until all the evidence in the case had been considered.
"Before saying something like that we must evaluate all the phone intercepts, and if sanctions will be passed on," he said.
"Let's wait, I think we must all wait with much calm and serenity. I am convinced that we will come out of this roaring."
Mr Moggi, along with Juve chief executive Antonio Giraudo, are two of 41 people under formal investigation.
Six-times European champions AC Milan, as well as Lazio, feature in the probe of 19 league games from last season.
The crisis led incoming Prime Minister Romano Prodi to suggest that a political "commissar" be put in charge of the Italian Football Federation (FIGC).