Pierre Gasly has confirmed reports that he is not sure how many races he will contest for Toro Rosso this year.

The man he has ousted in Malaysia - Daniil Kvyat - could be back in the car after the Malaysia-Japan double-header, as Gasly returns to fight for his title in Japan's Super Formula championship.

Asked about that possibility at Sepang, Gasly answered: "It's a really good question. At the moment I don't know exactly what's going to happen in the next couple of weeks."

One of Toro Rosso's sponsors declared this week that the Gasly deal is currently only for the next two races.

"At the moment, I don't know how many races I'm going to do," Gasly added. "There is nothing confirmed. The team told me to focus on this weekend and try to do my best.

"Of course I feel sorry for [Kvyat], I think he's a really talented driver. Unfortunately, it's happening and I'm taking his seat. But I'm pretty sure we will see him back on the grid at some point maybe. We will see what happens in the near future."