Red Bull motorsport advisor Helmut Marko has dismissed claims that Daniil Kvyat got the nod for the Toro Rosso seat due to next year's Russian Grand Prix.
Portuguese driver Antonio Felix da Costa was considered the favourite to replace the Red Bull-bound Daniel Ricciardo, but the seat surprisingly went to Russian teenager Kvyat.
The 19-year-old is currently taking part in the Formula 3 European Championship and GP3 Series while his experience in Formula One is very limited.
There has been speculation that his hasty promotion is linked to the inaugural Russian GP in 2014, but Marko says he was the best option for Toro Rosso in the medium term.
"No. We were looking at what's best for Red Bull and what's best for Toro Rosso in the medium term," he is quoted as saying by Autosport.
"All the people who have been involved in this decision said Daniil was the right candidate.
"Through his performances, he was a natural candidate, being fast, being mature. So in the medium term he offers the best perspectives."
Kvyat will partner Jean-Eric Vergne at Toro Rosso next year and, although his team-mate has been on the grid for a few years now, Marko believes the Russian will "challenge" Vergne.
"Of course he has to learn how Formula 1 is operating. He has to learn the circuits, but I would say after six to eight races he should be in a position to challenge Vergne," he added.