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Arsenal fans on Twitter have been left dumbfounded as it was announced that academy product Gedion Zelalem had departed the club on a free transfer.

The 22-year-old has moved to MLS outfit Sporting Kansas City, bringing a six-year association with the club to an abrupt and unfulfilled end and leaving many fans frustrated.

When the midfielder became the youngest Gunners player in FA Cup history in January 2014 by making an appearance against Coventry City, there was much excitement among Gooners, who believed that the club had a genuine talent on their hands.

The belief that Zelalem would one day break through and become a first-team regular is clearly one that was still held by fans up until he moved on to his native USA on Monday.

However, the relevant internal parties at Arsenal seemingly felt something different and have allowed Zelalem to switch North London for Kansas.

Check out some of the best reactive Tweets from the Emirates faithful, below...