Kieran Tierney told leaving Arsenal among 3 things he must do to become world's best player

Pat Nevin reckons former Celtic star Kieran Tierney can become the best player in the world – but only if he ditches Arsenal.

The BBC pundit reckons the Scotland defender needs to join a bigger club for his talent to really shine.

But if the likes of Manchester City or Real Madrid snap up the defender, Nevin reckons he can become a real rarity.

A defender who wins the Ballon d’Or.

Four years ago Nevin failed to persuade his former club Chelsea to take him from Parkhead to Stamford Bridge.

Instead the Hoops ace joined Arsenal where he is set to be named their player of the year.

Tierney grabbed his first Scotland goal in the midweek friendly draw with Poland and Nevin insists the world is at his feet.

He said: “Kieran hasn’t peaked yet, which is quite frightening.

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“When I first met him he was a confident boy but he’s gone beyond that to have this total and utter belief in himself.

“He is already one of the best footballers on the planet. He’s more than comfortable in the Premier League, which means he could play anywhere.

“I believe he can go on to win the Ballon d’Or.

Only one defender – Fabio Cannavaro, who captained the Italian World Cup- winning side in 2006 – has ever won that prize, but KT