Mariano joined the Cherry and Whites ahead of the 2014-15 season following an impressive debut season for Worcester Warriors despite their relegation from the Aviva Premiership.

The Argentinian second row joined the Warriors from Leinster after making 4 appearances for the Irish club.

Previously, Mariano represented Pampas XV in his native Argentina, a club that prides itself as the stepping-stone to help talented Argentine players towards a professional career in Europe, a club that incidentally Gloucester picked up front rower Matias Cortese from.

Mariano has made 25 appearances for the Pumas and appeared against England in the 2013 summer tour. At 6ft 8in tall, Mariano provides a quality line out option and vital strength in depth in the Gloucester engine room. 

A shoulder injury sidelined Mariano for much of the 2014/15 season, but his return was vital in helping the Cherry and Whites lift the European Rugby Challenge Cup.

He went on to make 19 appearances in his second season at Kingsholm and signed a new contract before making 23 appearances in 2016-17.