Leonardo Semplici has officially extended his contract with SPAL until June 2021, along with his entire staff.
The tactician, who turns 52 next month, had originally been tied to the club until June 2020.
Semplici is the architect behind their extraordinary rise from Serie C to the top flight, taking over in December 2014.
He then continued their achievements by maintaining their Serie A status for two years running.
Semplici had been linked with the vacant posts at Fiorentina, Genoa and Sampdoria.