Horner: Red Bull will be on 2016 grid

Red Bull team principal Christian Horner insists the team will be on next season's grid, despite their struggles to find an engine supplier.

The Milton Keynes-based team have endured a turbulent 2015 both on and off the track, with Renault's failure to deliver a competitive engine leading to Red Bull boss Dietrich Mateschitz threatening to leave the sport if they could not compete at the front of the field.

Red Bull thought they had sealed an agreement with Mercedes for 2016, and as a result began the process of terminating their contract with Renault a season early. However, no deal was struck with Mercedes and potential partnerships with VW and Ferrari have also come to nothing.

As a result, the team's future has been in considerable doubt, but speaking ahead of this weekend's Brazilian Grand Prix, Horner has said that they will be racing in F1 in 2016.

"We are committed to being in F1 next year and in the future," Horner told BBC Sport.

"We are working hard to put together as competitive a proposition as possible."

It is believed that Red Bull are now in talks with Renault to continue their partnership, but it's a deal that will come at a much greater cost to Red Bull.

Horner said he is hopeful of wrapping up an agreement in the coming weeks.

"I would hope by the close of the season we'll be in a position to announce what our plans are," he added.