McLaren boss Ron Dennis has claimed that Fernando Alonso's comments on race radio at the Japanese Grand Prix about the performance of his car were "not constructive".

The Spaniard was heard to criticise the power of the Honda engine, saying it was similar to being in a GP2 race.

However, while Dennis had admitted that Alonso's comments were unhelpful, he has suggested that he will not get too angry with the former world champion.

He told Sky Sports: "We are here in Japan, Suzuka, Honda's home track, we had the President of the Honda Motor Company, we had the head of R&D, chief executive of Honda motors - the three most senior people who are totally committed to winning a world championship and their curve is much stepper than they anticipated, but their aspirations and commitment has not diminished.

"I think that is an embarrassment, but I don't want to make any more of it. The drivers get relatively minimal interface with the management of Honda. They get interface with the technical people. Maybe this is to make the message is heard by everybody. I do not condone it, but I am not going to criticise our drivers. I will sort it behind closed doors.

"Today, Fernando is a completely different person. He's chilled and relaxed but he is a racing driver who needs to have the adrenaline, the passion and everything... He vents his frustration in different ways. I wouldn't say it's constructive but at the end of the day, I'm not going to get too angry about it."

Alonso finished 11th in Suzuka, with Lewis Hamilton taking victory.