Toto Wolff insists the reason behind Lewis Hamilton's delay in putting pen to paper on a new Mercedes contract is down to 'details' and not over an argument about whether he would be granted #1 status in the team.

The defending champion and current points' leader has repeatedly dismissed assertions that there is a fundamental reason stopping him from confirming a new deal with Mercedes, maintaining he is in no rush to sort it.

However, the delay has stoked rumours of discord behind the scenes, notably a possible desire to attain #1 status in Mercedes over Nico Rosberg, who signed his new deal mid-way through the 2014 season.

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In that deal, Rosberg is understood to have stipulated that no driver be given preferential treatment, an approach that Wolff maintains is shared throughout.

"That is all rumours - it is not true," when asked by the official F1 site whether Hamilton had been pushing for higher status. "It is down to the details - I would say that we are beyond the point of the critical topics.

"Lewis is [negotiating] very well. The level that he does it is quite surprising considering the fact that he has not done it in the past."

Though the terms of Hamilton's deal have been kept secret, the new contract is expected see him become the highest paid driver on the F1 grid.