Sidecar racers have the biggest cojones
Red Bull team principal Christian Horner does not believe a move for Lewis Hamilton would suit his team.
McLaren's Hamilton, 26, has been linked with a switch to Red Bull in the build-up to Sunday's British Grand Prix.
But Horner finds it "difficult to envisage" Hamilton and Red Bull's world champion Sebastian Vettel would work as a partnership.
"History dictates that two world-class drivers in the same team has not always been the best pairing," Horner said.
"You only have to think of Senna-Prost, Piquet-Mansell, or even Alonso and Hamilton.
"We are hugely happy to have Sebastian committed to the team long term, and with Mark [Webber], we're very pleased with the job he is doing.
But Horner was keen to pour cold water on any idea of Red Bull signing fellow Englishman Hamilton.
"I think it would be difficult to envisage a driver of Sebastian's calibre and that of Lewis under the same roof," Horner added.
"Lewis is a wonderful driver and you can understand why he might want to drive a Red Bull. It's obvious.
"But would it be the best thing for us? We have severe reservations it would be."