Toni has netted 20 times this season for the Gialloblu, including one in Saturday's 2-2 draw with Udinese.
"This has been a great season for us," he told Radio Sport. "No one would have expected this from us.
"And one of the main protagonists has been Toni. His 20 goals have been vital, and hopefully he stays with us.
"If he signs, then I'll renew myself."