Alexis Sanchez scores stunning goal during warm-up at Watford

Alexis Sanchez scored a stunning goal during the warm-up ahead of Saturday's 3-0 victory at Watford.

Watch closely - he his wheeling away in delight well before the ball hits the back of the net.

Sanchez scored Arsenal's first goal in the 3-0 win at Vicarage Road - that's 10 in six now for the Chile internationals....

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