Catellani began his career in the youth ranks of Reggiana, before being signed in a co-ownership deal with Catania in June 2006.

He was officially brought back to Catania in July 2008 following the resolution of his co-ownership with Lega Pro side Reggiana.

After spending the summer training and taking part in first-team friendlies, the young striker was loaned out to Serie B outfit, Modena to gain experience.

However, on 29 August 2009 it was confirmed that the young striker would return to Modena for one more season of first team football.

Catellani officially was loaned out to Serie B side Sassuolo on 1 August 2010,[2] joining former Catania teammate Mauro Minelli.