Lotus team boss Eric Boullier has apologised for the language used in the radio exchange between Kimi Raikkonen and trackside operations director Alan Permane in the Indian Grand Prix.

Permane was heard to tell to Raikkonen to 'move out of the ****ing way' when he was running ahead of team-mate Romain Grosjean in the closing stages of the race, with the pair making contact as Grosjean looked get ahead.

Raikkonen's reply was equally colourful and Boullier admitted that the language used shouldn't have been broadcast over the team's radio - with a promise there would be no repeat.

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"Romain was two seconds per lap faster than Kimi at that time, so it was not even a team order," he said. "By asking Kimi to let Romain pass, we just made the obvious choice, as Massa could have stolen our podium.

"With hindsight, this radio message could have been sent in a less emotional way. There was a lot of tension, a lot of potential technical problems, and some of the words that flew around were simply not appropriate.

"I know that quite a few people were surprised and I can only apologise for that on behalf of the team. It won't happen again."