Bale has struggled for consistency this season, but in the mixed zone after victory over Champions League opponents FC Basle, the Welshman did not want to discuss the issue.
AS reports a journalist asked why the best version of Gareth Bale, in terms of form and goals, has not yet emerged.
But the former Tottenham man snapped: "That's not a question for me."
He was then asked if, in his opinion, Real Madrid are the best team in Europe: "It is not for me to say that. We must stay focused and provide the best of ourselves."
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