Career
Stefanelli is a youth product of Romagna club Cesena. Stefanelli left for Verucchio of Eccellenza Emilia–Romagna in 2010-2011 season. He was a player for Cesena reserve in the whole 2011-2012 season, despite he missed the rest of season in January 2012.
In June 2012 he was signed by Crotone in co-ownership deal for €300,000, despite Cesena would only receive half of the registration rights of Fabrizio Bramati "worth" €300,000.
Stefanelli joined the pre-season camp of Romagna club Forlì in July 2012, along with Cesena players Leonardo Arrigoni and Mattia Filippi. However due to the injury Forlì did not sign Stefanelli, instead signed Daniele Ferri who owned by Cesena and Brescia.
Stefanelli was signed by San Marino Calcio on 31 August 2012, a Sammarinese club in Italian football leagues. Stefanelli did not play any game either.
On 20 June 2013 the co-ownership of Stefanelli and Bramati were renewed.
In summer 2013 Stefanelli joined Juvenes–Dogana. In June 2014 Cesena gave up the remain 50% registration rights. On 12 July 2014 he was re-signed by San Marino.
International career
Foreign U19, Stefanelli played all 3 games of 2011 Union of European Football Associations European Under-19 Championship qualification. as well as in 2010 edition
Stefanelli made his competitive San Marino U21 debut on 3 September 2010, the last match of 2011 Union of European Football Associations European Under-21 Championship qualification. He also played first 4 games of 2013 Union of European Football Associations European Under-21 Football Championship qualification Stefanelli did not participated in any matches of 2015 Union of European Football Associations European Under-21 Football Championship qualification. senior
Stefanelli played 5 times in Union of European Football Associations Euro 2016 qualifying.