Former Arsenal and Tottenham Hotspur defender Sol Campbell claims Arsene Wenger has been unable to nail down Theo Walcott's best position in the starting lineup. He can play as a lone striker or also on the wide positions, where he prefers to cut in from the wings.

The England international started against Manchester United and led the north London club's attack, ahead of Olivier Giroud. Arsenal suffered a 3-2 defeat at the hands of the Red Devils at Old Trafford and Walcott's poor display was heavily criticised.

Campbell has backed the 26-year-old and suggested the recent criticism directed towards the forward is not warranted. The former Gunners star has urged Wenger and Walcott to hold "honest talks" in order to find the player's best position.

"I don't think it's fair. He's a great lad who has played for England and done very well. He doesn't deserve all that," Campbell told

"He (Wenger) needs to set the team up and explain to Theo where he wants him on the pitch. What is his best position? As a centre-forward or out wide coming in? That conversation needs to happen between the manager and player and it needs to be a frank and honest conversation.

"He needs to get into his head and play the game for him and show him the light. Be a real mentor."

Wenger will take his men to White Hart Lane as they face Tottenham in the north London derby on 5 March. Campbell has played for both clubs during his playing career and the ex-defender believes Arsenal are still the dominant team in north London.

"If you're looking at quality of football then Arsenal's quality of football has been superior. You have to look at it over five to ten years to see how consistent they are and Tottenham have really come into their own this season. They have improved but let's see after five seasons," he explained.