McLaren drivers Jenson Button and Fernando Alonso have expressed their sadness if Red Bull were to pull out of F1 next season.

Red Bull's commitment to Formula 1 is still in doubt after Mercedes and Ferrari both denied a supply of engines as it didn't want to help a main rival with latest specification power units. Ferrari did however offer Red Bull a similar deal given to Sauber and the new Haas F1 team.

The ongoing debate has recently been intensified after the FIA confirmed power unit manufacturers Ferrari, Mercedes, Renault and Honda will not be allowed to supply lesser specification engines to customer teams in 2016.

Related Articles

This comes after the speculation that Toro Rosso could run 2015-specification engines from Ferrari in a new engine deal after its split from Renault.

As the story rumbles on both McLaren Honda drivers say it would a poor state of affairs if F1 were to lose both Red Bull and Toro Rosso, with Button believing the sport would have no option but to implement three-car teams next year.

"If they [Red Bull and Toro Rosso] left F1 it would definitely change and it would be a very sad loss for the sport because they are a very big part of it," Button said. "They have two teams at the moment and a lot of very talented people who have achieved so such in their short period in the sport. It would be very sad to see them go. Hopefully it is only rumours and speculations."

"Yeah, that's sad," Alonso concurred. "Hopefully they will find a solution, but from outside it is difficult to understand because a top team like Red Bull combined with an engine manufacturer could win, but of course it clashes with their own interests.

"It is a bit of a strange situation with everything combined, but I think for the good of the sport they will find a solution."