Pastor Maldonado is closing in on a Lotus deal for next season but concedes it is not definite until it is signed.
Having opted to leave Williams at the end of Sunday's Brazilian Grand Prix, Maldonado has been in talks with several teams including Lotus.
His talks with the Enstone team reportedly heated up at Interlagos with the Venezuelan expected to be confirmed in the coming days.
"We are quite close," he told Autosport.
"We have been working very hard since many months ago and now we are just waiting for confirmation - all the stuff that you need to do with contracts.
"But until you sign you never know. I prefer to sign and to be 100 per cent sure before we make an announcement."
As for his decision to leave Williams, the 28-year-old reckons it is the right move not only for him but also the team.
"I think it was the best decision for me, and for the team, because I did not feel quite well there.
"It can happen even in the best family. The team I knew in 2011 changed a lot, and I was not full of confidence with the people around the team at the moment.
"The race team is fantastic, amazing, and I will miss them because together we have been fighting even in very tough conditions.
"All my guys have been working very hard for me and I have been working very hard for them, I will miss them."
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