Sergio Perez says he will remain with Sauber this year despite speculation linking him with a move to Ferrari.
The Mexican was impressive in finishing a close second behind Ferrari's Fernando Alonso in Sunday's Malaysian Grand Prix.
In contrast, Ferrari's Felipe Massa has struggled in the opening two races.
Perez, a member of Ferrari's driver academy, said: "Obviously it's only rumours but no, I will stay with Sauber for the whole season."
Brazilian Massa was way off the pace of Alonso in the season-opening race in Australia, and although he was more competitive in qualifying in Malaysia, he again struggled in the race.
Meanwhile, Alonso is leading the championship after adding an unexpected victory at Sepang to his fifth place in Melbourne.
Ferrari team principal Stefano Domenicali said on Sunday after the Malaysian Grand Prix: "We need to stay close to Felipe in this moment. It's a difficult moment and we need to find a way for him to get confident in his car.