Despite playing in Serie B, Tonali's exploits have not gone unnoticed by some of Europe's biggest clubs.
Blues boss Maurizio Sarri has been aware of Tonali's talents since he was in charge of thePartenopei.
He told TribalFootball.com: "It actually reminds of Pirlo, especially with his smart passes.
"He has the same attitude and he moves like Pirlo. Undoubtedly he studied him a lot.
"Good playmakers are rare and they can make the difference on the pitch, particularly in Premier League, where this kind of player is very rare."
Tonali made his debut in August 2017, aged 17, and has scored two goals and provided five assists in 29 first-team appearances.