BARCELONA (REUTERS) - Valtteri Bottas has denied signing a pre-contract with Ferrari, saying he was amused by some of the speculation about his Formula One future.

"I saw some and heard plenty of stories and it's sometimes quite funny to hear those because in the end you know what's the case and what's not," the Williams driver told reporters at the Spanish Grand Prix on Thursday.

"There's a lot of people making up stuff. The fact is that at the moment I am just focusing on this season and getting the maximum for us as a team. Then the rest I don't know yet," added the Finn.

Finnish and Italian media have reported rumours suggesting Bottas had an agreement with Ferrari, who have 2007 champion Kimi Raikkonen out of contract at the end of this season, for 2017 if not 2016.

Asked directly whether he had signed any such pre-contract, Bottas said that was not the case.

The Finn, who will also be out of contract at the end of 2015, has become one of Formula One's hot properties after finishing fourth overall last season with six podium appearances.

"There has been always many kind of rumours so I'm not really thinking about those," said the 25-year-old. "That's for my management to think about. "At the moment I am not thinking about any move."