Education
On 6 July 2010, Belec completed a loan to Serie B club Crotone.
On 6 July 2010, Belec completed a loan to Serie B club Crotone.
Internazionale
Signed by Internazionale along with Rene Krhin at the age of 16, Belec spent 3½ seasons with F.C. Internazionale Milano Primavera team He also played for Campionato Nazionale Allievi under-17 youth team in 2006-2007 season. In 2007-2008 season, at first he had to compete with Enrico Alfonso for the starting place in Primavera team until Alfonso left the club in January 2008.
He then became the fourth keeper of Inter"s first team
Under José Mourinho, Belec received several first team call-up since 2008-2009 season and made his first team debut on 17 July 2009, on a pre-season friendly. He also played at World Football Challenge.
In November 2009, he signed a reported 5-year contract with the club Crotone
He made his debut on 5 September 2010 after Emanuele Concetti was not available.
He then became the first choice goalkeeper ahead of Concetti since round 18.
However, in 2011-2012 Serie B, his former Inter "team-mate" Giacomo Bindi took the starting place from round 2 to 4 and again since round 9, made Belec becoming the understudy. However after a 0–3 defeat to Brescia, Belec re-took the starting place. Despite Leonardo Menichini was sacked again on 23 January and replaced by caretaker Massimo Drago, Belec remained as the starting keeper of Drago"s squad.
Return to Internazionale
Belec returned to Inter during the summer 2012 window after his loan deal to Crotone expired.
He was kept as a third choice keeper behind Samir Handanovič and Luca Castellazzi. He made his first team debut on 30 August as a substitute in a Union of European Football Associations Europa League game against Football Club Vaslui to replace Antonio Cassano after starting goalkeeper Castellazzi was sent official
Sporting Clube Olhanense
On 15 July 2013, Belec completed a loan to Sporting Clube Olhanense, from the Portuguese Primeira Liga. Konyaspor
On 1 September 2014 Belec was signed by Konyaspor in a temporary deal.
On 2 February 2015 the loan was terminated.
Carpi
In summer 2015 he terminated contact with Inter Milan. On last day of summer transfer window, August 31, 2015, he signed with Carpi Football Club 1909 for one season, with possible extension for two more years. After debut he become regular started in first 11 for Capri.
Belec received a call-up to 2009 Union of European Football Associations European Under-19 Football Championship elite qualification.
He was the first choice in 2008 and 2009 Union of European Football Associations European Under-19 Football Championship qualification. Belec received a call-up to Slovenia national under-21 football team in September 2010, he was the backup of January Koprivec.
On 1 October, he received another call-up against Hungary, which the team was composed with players that eligible to 2013 Union of European Football Associations European Under-21 Football Championship (born 1990 or after). However he did not play that match.
He received a call-up from the senior team in February 2011, after the injury of Samir Handanović, for a friendly match against Albania.