Lazio coach Maurizio Sarri has hailed the form of Luis Alberto - though admits he could leave this summer.
The Spanish veteran again impressed for victory over Udinese on Sunday.
Sarri said: "From November onwards, he has become another player.
"Today I am happy with all the midfielders, he has become a total player, he has great participation defensive, with also the same offensive qualities.
"If he wants to stay I would like to keep him, the biggest mistake we could make is to keep players against his will, I will be happy if he stays."