Romain Grosjean is "in pole position" to retain his Lotus seat, with confirmation expected "very shortly".

Lotus has endured a difficult season, with Grosjean scoring all eight of the team's points having ended 2013 in impressive form with six podiums. Grosjean was waiting on Fernando Alonso's movements at Ferrari, but with Sebastian Vettel set to move to Maranello, Lotus has emerged as his best option and deputy team principal Federico Gastaldi confirmed an agreement was close.

"Romain is in pole position for that place and honestly it's a case of us finalizing a few details," Gastaldi said. "We expect to have an announcement very shortly. Like the technical package confirmation there has been a lot going on in the offices at Enstone, as well as the pits and paddock. It is all looking very good and exciting for the team going forwards."

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And Gastaldi admits the addition of Mercedes power units in 2015 makes the team more attractive to Grosjean, hoping that it marks the start of the team's recovery after this season.

"Obviously it was something that was in the pipeline. Behind the scenes we realised it was time for a new direction and we are very happy we can finally confirm this publically. Mercedes AMG High Performance Powertrains have already made a positive impression and we believe that they will be a key ingredient for future success.

"It has become obvious this year that they have the most competitive package on the engine side. Their strengths, allied to ours, will form a potent combination in 2015 and create a special E23 Hybrid package. The partnership also forms a key ingredient for the long-term future of Lotus F1 Team."