Christian Horner believes Max Verstappen and Daniel Ricciardo can give Lewis Hamilton and Sebastian Vettel a “hard time” next season, Red Bull just have to deliver the car.

Although Red Bull made a slow start to this year’s championship, the team’s results have steadily improved throughout the campaign.

This has resulted in two wins in the last four grands prix for Verstappen while Ricciardo’s sole win came in Baku.

The team-mates are currently holding down fourth and sixth in the championship with Ricciardo ahead with Verstappen having suffered the bulk of Red Bull’s reliability issues.

Next season, though, Horner reckons his drivers could be further up the order.