The 23-year-old England striker moved to the north London club on transfer deadline day after he was deemed surplus to requirements at Manchester United.
He’s the same price as Mario Balotelli but Welbeck will be here for the long term
Questions have been raised about Welbeck’s goal-scoring ability after a return of 29 goals in 142 games for United.
However, former defender Keown feels that the forward could follow in Emmanuel Adebayor’s footsteps and develop into a top finisher.
“Welbeck is not clinical in front of goal but he’ll practise that,” Keown told the Daily Mail.
“I remember Emmanuel Adebayor rarely hitting the target when he first joined Arsenal but Wenger had him practising and the improvement was phenomental.
“He’s the same price as Mario Balotelli but Welbeck will be here for the long term, Balotelli won’t.
“My only worry is that he could be in mourning about leaving such a great club. He needs to realise he has joined another and can finally take centre stage.”
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