Russian Football Union (RFU) chiefs are considering taking legal action against former national manager Dick Advocaat for breach of contract, the body's deputy president Nikita Simonyan said on Wednesday.
"The RFU's contract with Advocaat expires on July 15," Simonyan said.
"Advocaat meanwhile left our team on June 16 right after a defeat at the hands of Greece at Euro 2012 and has already signed a contract with PSV Eindhoven on July 1. This action violates his effective contract with the RFU."
Simonyan added that Advocaat's demands for payment of the final month of his contract - which is estimated to be a sum around 300,000 euros - were baseless.
"We have invited Advocaat to attend an RFU meeting to listen to his report about his work with our team," Simonyan said. "But I'm afraid we will never see him again. And it seems to be the real violation of contract.
"The breach of professional ethics by Advocaat upsets me much more than the contradictions in the legal technicalities of his contract."
Advocaat announced he was stepping down even before the kick-off of Euro 2012 and then guided the team to a disastrous first round exit.
He is now working at PSV Eindhoven.