Lazio boss Delio Rossi was unhappy with Mauro Zarate at the end of their 1-0 victory over Palermo.

Tommaso Rocchi came off the bench to score, replacing a visibly irritated Zarate, who continued to scowl even after the goal.

"I am happy for Rocchi, he is getting back to the great player he is. I have three excellent strikers and it's up to me to find the right system," said Rossi.

"Zarate is 21 years old and he had an explosive start to the season, but now he is in competition with the rest of the squad. Anyone who doesn't want competition should join a smaller club."