Lazio coach Delio Rossi is fed-up with the contract talks over striker Mauro Zarate.

Zarate is on-loan from Qatar's Al Sadd and negotiations over a permanent deal are proving difficult.

"I know these tricks by now," rapped Rossi. "The truth is Zarate became a first team regular at his first experience in an important side like Lazio.

"His brother's words therefore leave me perplexed. Have we reached the point where a Coach can't even make a substitution any more?

"He even said that the club had forced me to field Zarate. It's completely untrue. It is interesting that this all comes out towards the end of the season, though."