Portsmouth manager Harry Redknapp and chief executive Peter Storrie were among five people arrested on Wednesday by police investigating corruption in football, the Premier League club said.
Former Portsmouth chairman Milan Mandaric, now in charge at Championship side Leicester City, said later via a spokesman that he had assisted City of London police with their enquiries into a matter that went back to 2003.
The comments closely echoed an earlier statement by Portsmouth spokesman Gary Double, who said: "They (Redknapp and Storrie) have been asked to help police with their enquiries concerning a matter dating back to 2003.
"This was prior to the new owner taking control of the club at the beginning of 2006. "The club is fully supportive of Peter and Harry who are co-operating fully with City of London police in this ongoing enquiry."
On his release from Chichester police station later on Wednesday, Redknapp was quoted by the BBC as saying: "We all helped the police with their inquiries but it doesn't directly concern me, it's other people involved.
"I've been answering questions to help the police. I am not directly concerned with their inquiries. "They have to arrest you to talk to you, for you to be in the police station. I think that's the end of it, it didn't directly concern me."
A solicitor representing Redknapp and Storrie added: "The inquiries do not relate to either of those individuals, they relate to entirely different individuals."