Jeremy Clarkson has been warned by BBC TV Danny Cohen boss that "no one person is bigger than the BBC", after he made a string of headline-hitting gaffes.
Mr Cohen ordered an internal investigation into Top Gear following a string of controversies which saw it criticised by Ofcom for breaching broadcasting rules over a "racial" term used by Clarkson.
The regulator decided the comment, made by the star during the programme's Burma special screened in March, was offensive.
The ruling came just three months after Clarkson apologised and was given a "final warning" by the BBC after an unaired clip appearing to show him mumbling the 'n-word' emerged.
Mr Cohen told BBC Radio 5 Live today: "I've been very clear with what I think is acceptable on the BBC, I've been very clear that no one person is bigger than the BBC."
Commenting on the n-word incident, he added: "Regardless of it being on television or not I don't want that stuff going on when we are on production, when you're representing the BBC."
In a letter to the Guardian earlier this month, Mr Cohen said he disagreed with Clarkson's language but insisted the 54-year-old was not "racist".
Clarkson has also been criticised by mental health charities after he called people who had thrown themselves onto railway tracks ''selfish'' and was forced to apologise for his comment that "striking workers should be shot".