The highly rated attacker has impressed for the Championship outfit and will continue his development at Griffin Park for the rest of this season.
Canos joined Brentford at the end of August and his loan was due to end at the start of 2016, but the two clubs have agreed on an extension and the move will go through when the Transfer Window opens on January 2nd.
Canos arrived at Liverpool from La Masia and can operate in a number of attacking positions. The Spaniard can play as a wide forward or as a striker.