Sir Dave Brailsford says accusations of doping from pundits and spectators spurred Chris Froome and Team Sky on to victory at the Tour France.

Froome emerged triumphant for the second time in three years on Sunday and it was a third success in four years for Team Sky.

But the team had to endure allegations of doping from pundits and fans, while Froome had urine thrown at him by spectators and was also spat at during the race.

Brailsford says the allegations and abuse made the riders even more determined.

Brailsford says he is confident Froome can challenge for the Tour de France title again next year.

Runner-up Nairo Quintana gave Froome a tough time in the Alps during the closing stages of the race, but Brailsford thinks Froome’s all-round prowess and the strength of Team Sky can give him the edge.

Meanwhile, Chris Froome says a bid for back-to-back grand tour titles "could be on the cards" as he considers following up his Tour de France victory by riding the Vuelta a Espana.

Froome is yet to make a decision on whether he will compete in Spain, where he was the runner-up last year and in 2011, as well as fourth in 2012.