Arsenal know precisely how dangerous Robin van Persie can be, but Arsene Wenger does not think that will make it any easier to stop the Manchester United forward.

The Gunners are set to face off against their former captain for the first time since his £24million summer move to Old Trafford on Saturday lunchtime.

Van Persie netted some 132 goals in eight seasons with the north London club, and Wenger said: "Robin Van Persie has a great quality in the fraction of a second that he understands where to go - you can talk and talk and talk, but defenders have to read that at the same time. His speed of analysing those little pockets around the box are absolutely exceptional."

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