Kieran Tierney announced his return to training with Arsenal by nutmegging Shkodran Mustafi. It was a light-hearted moment to mark the Scotsman's recovery from a hip problem, but his new team-mates will discover pretty quickly that the summer signing from Celtic can cause a stir on the training ground in other ways too. Tierney is full on. Ronny Deila, the Norwegian coach who gave him his professional debut, recently recalled how senior professionals would give the youngster a wide berth during sessions because of his aggressive approach. Scott Brown, his captain at Celtic, was never one of those but when the notorious midfielder says Tierney would tackle his own granny, it speaks volumes....
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