The governing body confirmed the Italian would be banned for the match on February 21 in Naples and March 14 at Stamford Bridge.
They rejected his appeal against his two-match suspension for improper conduct at the Champions League Group A game against Villarreal in December and added a third game, suspended for a probationary period of two years.
A statement from UEFA read: "SSC Napoli coach Walter Mazzarri will be banned from carrying out his duties in both legs of the UEFA Champions League tie against Chelsea FC after a decision by UEFA's Appeals Body."
Mazzarri clashed with Villarreal striker Nilmar during a game in Spain on December 7.




 





