Anderson, who celebrates his 28th birthday in November, signed a three-year deal with the White Knights this month after his contract with Brazilian third tier Rio Branco ran out.

But now his contract with the Cairo side could be declared null and void, as FIFA's regulations state that players cannot sign for two teams in the same transfer window.

"An official from Nasr told me on the phone that Anderson had put his signature to a contract with his club two months ago," agent Mamdouh Al-Saati told FilGoal.com.

"He said he was flabbergasted when he was told about Anderson's deal with Zamalek.”

"Nasr will call on the Japanese FA to send the player's International Transfer Certificate 'ITC', pursuant to the contact he allegedly penned.

"They will send another fax on Wednesday morning to the Egyptian FA to formally inform them with the situation, which should make Anderson's contract with Zamalek invalid."

Anderson had a dazzling season-long spell at Rio Branco, having finished last term as his team's top scorer with 22 goals.

He also played for Japanese clubs Mito Hollyhock, Sagan Tosu, Shimizu S-Pulse and Yokohama F.C throughout his career.