Insigne scored twice in the Partenopei's 3-1 win over Bologna on Sunday night.
“Of course, there are top clubs interested in him," agent Vincenzo Pisacane told Radio Punto Nuovo.
“We are flattered by the interest of these clubs, but we only want to end the season at certain levels. There will be time to discuss the contract extension," he added.
Insigne's contract with Napoli ends in June 2022.
“The only thing he is thinking about is Napoli and the qualification for the Champions League. He feels the responsibility of being captain," Pisacane claimed.
“Lorenzo has an extraordinary relationship with everybody, he is suffering for Ghoulam and he immediately sent him a message."