Attacking midfielder Jon spent the 2014/15 season on loan at Championship side Brentford.
The Spanish youngster made 37 appearances and scored six goals for the Bees, including a memorable hat-trick against Blackpool.
Jon Toral Profile
February 05, 1995 Reus, Spain
An expert dribbler who can play on either flank or in the No 10 role, Jon (full named Jon Miquel Toral Harper) was involved with the first-team squad for last year’s pre-season tour to New York, and also played in the friendly against Boreham Wood.
Returning to the club with vital first-team experience, the elegant Spaniard played for the Arsenal on the pre-season trip to Singapore.