Bernie Ecclestone says the way former world champions Sebastian Vettel and Fernando Alonso have acted this season has "disappointed" him.

Vettel endured a tough campaign in 2014 as Renault's lack of performance from its new power unit made it impossible for Vettel to attempt to defend his title. However, off the back of four consecutive championships Vettel was also beaten by new team-mate Daniel Ricciardo before announcing he would leave Red Bull and Ecclestone says he's handled this season badly.

"I'm a super supporter of Sebastian, but I'm a little bit disappointed with his attitude, which I think has changed," Ecclestone wrote in the official Formula One season review. "He's acting like a defeated guy, and he isn't - that's not his mentality.

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"He's a competitive guy. He doesn't like losing at backgammon. Unfortunately, when he plays me, he does."

And it wasn't just Vettel who had not lived up to Ecclestone's expectations, with Alonso also coming in for criticism for the way he acted once it became clear he would not be a Ferrari driver in 2015.

"Ferrari was very disappointing, getting lost somewhere. Fernando got a little bit like Sebastian halfway through, so I'm a little disappointed in him, too."