Christian Horner says Daniil Kvyat will be a Red Bull Racing driver next season after the Russian driver admitted he hadn't had 'official confirmation' on any deal for 2016.

The Russian driver ended a positive second year in F1 - his first as a Red Bull Racing driver - with another top ten finish in Abu Dhabi, Kvyat in turn sealing seventh the overall standings ahead of arguable No.1 driver Daniel Ricciardo.

However, despite an impressive turn of form in 2015 - including a maiden podium in Hungary and a brief stint leading a race in the USA -, Kvyat has remained fairly uncertain about his future in the wake of the team's ongoing discussions regarding an engine supply.

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Indeed, though Red Bull used the final round of the season to 'confirm' it has sourced an engine supply for the 2016 season, Kvyat - though positive - suggested he had not sealed a deal for himself.

"To be honest, from what I heard, probably yes, maybe but I have to have some [confirmation]. At the moment I still have to have some more official confirmation, so we have to wait and see."

However, Horner has seemingly since allayed his fears, assuring the media that Kvyat 'is under contract and he will be a Red Bull Racing driver [in 2016]'.

Official confirmation notwithstanding, Red Bull is set to retain all four of its drivers - including Max Verstappen and Carlos Sainz at Toro Rosso -, but the RBR team will run self-developed Renault engines and Toro Rosso is set to use Ferrari power units.