Fernando Alonso has 2018 offers from rival Formula 1 teams

Double world champion Alonso has not finished on the podium since rejoining McLaren in 2015 and his current deal expires at the end of the year.

Alonso has said that he only wants to stay in F1 if he has competitive machinery.

But his options are limited with Ferrari and Red Bull full and Mercedes set to re-sign Valtteri Bottas to partner Lewis Hamilton.

On Saturday, rumours linking him with a move to Williams started swirling around the Belgian Grand Prix paddock.

When asked to comment on speculation, Alonso did not address it directly but said: "I will have a think and take decisions in the next month.

"Definitely I have some offers.

"I did have offers in June, in July, in August.

"[To] 60 per cent of them I said no already and the other 40 is still on the table."

When asked about Alonso, Williams technical director Paddy Lowe said: "It is that time of year when people write these sorts of stories.

"We haven't announced who is driving for us next year. It's something we're still working on.

"I'm not going to comment on it, either, or rule it in or rule it out."

Alonso has not ruled out leaving F1 altogether and competing in a different racing series, having made his debut in the Indianapolis 500 earlier this year.

"I haven't thought about my decision yet," he said.

"I will wait and I will take the best decision for me and the one that makes me more happier next year.

"I'm very relaxed. I will wait as long as possible to have better and more clear ideas and more clear projects, so let's see."