Toto Wolff says the ban on team radio informing drivers how to improve their or the car's performance is "complex and controversial".

The FIA wrote to the teams on Thursday to inform them that it would be strictly enforcing Article 20.1 of the sporting regulations which states: "The driver must drive the car alone and unaided." The move is intended to stop teams telling their drivers where they can find time, especially compared to their team-mates - a tactic Mercedes has used frequently so far this season - and Wolff says further clarification is required as he foresees almost certain disputes.

"Away from the racing, it's been a busy week for both the team and for Formula One," Wolff said. "On track, it has been confirmed that we will now see less radio traffic. This is a complex and controversial decision which will require a significant effort from the teams to understand how best we can work around it.

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"The directive is not yet fully clear and there will inevitably be some controversy, so it will need further clarification as to how much the essential on-track procedures will be affected - particularly before the start of the race."

Reflecting on the end of the European season, Wolff said he was delighted that Mercedes was rewarded with a one-two following a number of tough races.

"Italy was a fantastic way to wrap up the European phase of the season after a tough few weekends at the preceding races. It was our first one-two finish since Austria and, realistically, the results in between had not matched the high standards we set ourselves as a team.

"To see both drivers on the top two steps was a thoroughly deserved reward for all the hard work put in by the people at Brackley, Brixworth and Stuttgart. Lewis produced a fantastic drive to recover from a difficult start and take a well-earned win. For Nico, it was unusual to see a few mistakes when he is usually so consistent - but he has all the mental strength required to bounce back."