Renault e.dams team chief Alain Prost has concerns over championship contender Lucas di Grassi’s on-track conduct heading into this weekend’s season finale in Montreal as the rivalry with Sebastien Buemi hots up.

Buemi and di Grassi collided on the opening lap of their title showdown in London last year, the latter appearing to run into the back of his Renault rival.

The pair have been warming up a war of words ahead of Montreal, and Prost admitted to concerns about how di Grassi may act on-track this time around.

“We have some concerns, yes,” Prost told Current E. “I don’t want to comment too much, but we have some concerns, because we have seen things, not only in London.

“I hope that we don’t have this kind of incident again.”

Buemi heads into the final race of the year 10 points clear of di Grassi despite missing the last two races in New York, but Prost is relaxed about the Swiss racer’s chances of defending his title.

“Without the clash two weeks ago in New York, I think it could have been decided there,” Prost said. “For Seb going back, the last race and having only 10 points, it must be quite difficult with the pressure.

“But we are quite relaxed. It looks like the track is very good, so it’s very important for us because if you have a tricky track and maybe a little bit that you have a risk of accidents or whatever, this one looks quite good.

“We are quite confident. We have done some good testing before we arrive here, so we are quite confident that we can be competitive and if possible we would like to finish with a win.”