Born in Olot, Girona, Catalonia, Granell began his career with local amateurs CE Farners, and played in Tercera División in the following years, representing CD Banyoles, AEC Manlleu, UE Llagostera and UE Olot, all also from his native region. With the second to last team he achieved promotion in 2011, appearing in 34 matches and scoring three goals.[1]

Granell first arrived in Segunda División B in 2012, after returning to Llagostera. After starting rarely, however, he moved to fellow league side Cádiz CF on 28 December 2012.[2] On 1 August 2013, he signed with AE Prat also in the third level.[3]

On 30 June 2014, Granell joined Segunda División's Girona FC, signing a two-year contract.[4] He made his debut in the competition on 24 August, starting in a 1–0 home win against Racing de Santander.[5]