Ron Dennis says Fernando Alonso didn't show 'professionalism' when he commented that the power of his McLaren-Honda was akin to a GP2 car during the Japanese Grand Prix.

The Spaniard commented that he was 'embarrassed' whilst being overtaken by other cars during Honda's home race at Suzuka, his strong starts simply highlighting the car's lack of straight-line speed as rivals came back through.

With Alonso getting onto the team radio to say 'It feels like GP2 - embarrassing, very embarrassing', the two-time champion nonetheless persevered to turn in an 11th place finish despite the deficit in pace.

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However, his comments on a day when many of the top brass from Honda - as well as Dennis - were present to watch the Japanese Grand Prix, received short shrift from the McLaren CEO, suggesting the comments weren't appropriate considering those in attendance.

"I'm not going to condone those sorts of things because it doesn't show the professionalism that I would like our drivers to show," he said. "He's in the car, he's frustrated and of course his exposure is to the technical staff, but it was not a particularly constructive way to communicate with everyone at Honda.

"The way for me to deal with drivers is either through the appropriate management channels of Eric [Boullier] of in certain circumstances talk to them myself. However I choose to do that remains a team matter and not a matter for the media."

Despite the dressing down, Dennis - who famously fell out with Alonso during his brief time at McLaren in 2007 -, feels the harsh words are more the result of frustration than overall disdain.

"I think it's just frustration," he continued. "Anything that is coming out of our drivers at the moment has its origins in frustration and disappointment and demotivation. We are all demotivated, but I still can't understand why everybody doesn't appreciate the fact that you are not going to win the world championship if you have a second string engine, it's just not going to happen. Therefore, we have got to go through the pain and the learning curve to get a competitive engine.

"That is not a derogatory comment against Honda. Honda had the president of the company, the president of R&D, the president of the Honda motor company, all of these people are here totally committed. They understand what has to be done and of course they are resourcing, increasing resources and putting more money and effort into it, but we will get there."