Lazio coach Delio Rossi has called for Mauro Zarate to be signed permanently.

Zarate struck in last night's Coppa Italia semifinal victory over Juventus, but remains on-loan from Qatar's Al Sadd.

"I think that if Lazio want to improve then they have to keep their best players. Mauro used to play a bit for himself, but he is learning to work within the team and getting better all the time," said Rossi.