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Gallery: Arsenal and Unai Emery receive huge double injury boost as key duo return to training

Arsenal have been handed a welcome injury boost as Kieran Tierney and Hector Bellerin took part in full training ahead of the Gunners’ trip to Watford.

The full-back pair were originally expected back in training at the end of September, but the duo have returned ahead of schedule and could push for first team football in several weeks.

Bellerin has been out since January after suffering a cruciate knee ligament injury against Chelsea, and has undergone intensive rehabilitation since.

Scotland international Tierney joined Arsenal from Celtic in the transfer window for £25m, but is yet to play a minute for the Gunners after undergoing a double hernia operation during the summer.

Arsenal travel to Watford in Sunday’s Premier League clash, but the game will come too soon for the…