Rome, Jan 22 (IANS/EFE): Negotiations aimed at bringing Brazilian midfielder Kaka back to AC Milan from Real Madrid have ended in failure, the Italian club's chief executive said Monday.

Despite Kaka's willingness to take a pay cut, the transfer was not "practicable" because of the vast discrepancies between the Spanish and Italian tax systems, Adriano Galliani told reporters at a publicity event.

"There have been decisive complications," the Milan director said. "Kaka has made all possible and unimaginable efforts, but the taxation problems have led Real Madrid to end the negotiations."

Kaka had a stellar six-year run with the Red and Blacks before leaving for Spain in 2009. He helped lead the club to the UEFA Champions League crown in 2007, when he also won the Ballon D'Or, but has not had the same success since joining Real Madrid.

The 30-year-old playmaker, who signed with Real Madrid in June 2009 for a then-record 67 million euros, was sighted last Wednesday in Italy dining with fellow Brazilian international and current AC Milan striker Robinho.