Lotus Renault GP team boss Eric Boullier has issued an open invitation to Mark Webber by revealing he is keen to sign the Australian if he decides to leave Red Bull Racing at the end of the season.

Webber's latest twelve month deal with Red Bull comes to an end at the end of the current season, with the Australian yet to put pen to paper on an extension that would keep him with the team into 2012.

Although Webber has said that staying with his current team would be the best option for the new campaign, Red Bull has been linked with other drivers in recent weeks - most notably Lewis Hamilton, although that rumour has been played down by both driver and team alike.

However, having been unable to match team-mate Sebastian Vettel so far this season and with the German viewed by many as Red Bull's golden boy, Webber could be open to the idea of moving elsewhere - with Renault prepared to offer him number one status within the team.

Quoted in Australia's Daily Telegraph, Boullier said he had spoken to Webber about a possible deal and that the ball was in his court if he did decide to look at options away from Red Bull when it comes to deciding where his future lies.

"I really like Mark and I have known him for a long time," Boullier said. "We have discussed it from time to time, but we have never pushed him to ask what he wants to do because that decision is up to him.

"The day he wants to leave Red Bull, he has my number and he knows I am interested. He has to tell us what he wants to do. If he seriously is considering moving away from Red Bull, then, yes, I am happy to sit down and discuss it with him. He needs to make a decision.

"If Mark tomorrow calls me, I will sit down with him and have a proper chat."