Francisco Javier Pujolar will be serving as Jean-Eric Vergne's race engineer for the 2014 world championship season, the driver revealed this week.

"I will have a new race engineer, Francisco Javier Pujolar, because my previous one, Phil Charles is switching to the role of Chief Engineer this year," Vergne told the team's website on Thursday.

Charles had been Vergne's race engineer ever since the 23-year-old Frenchman joined Toro Rosso's race driver line-up in 2012. Pujolar previously worked at HRT, and more recently served as Williams' chief race engineer in 2013.

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Pujolar's exit from the Grove-based team has stoked speculation that Ferrari's Rob Smedley might be on his way to Woking to continue his working partnership with Felipe Massa.

Vergne himself is currently in Chamonix in the French Alps, going through his rigorous pre-season training regime with only three weeks to go before the first test session of the year, scheduled for January 28 in Spain.

"This is the first week, so it's nothing too demanding, just building a solid base and then next week, we will step up the pace," he explained. "It's vital to get as much work done now over the winter, to build up a 'reserve' of fitness for once the season starts. There will be more of the same after the first F1 test in Jerez.

"This week is the first time I have worked with my new trainer, Juuso," he said. "Surprise, surprise, he's another Finn and Antti, who worked with me since I started in F1 has been here with us for the first couple of days to pass the baton!"

Vergne added that he was in good company at the winter resort. "Jules Bianchi is here, along with lots of other French karting and single-seater drivers," he said.

"I have been coming to Chamonix with them for the past six years, although apart from doing some mountain climbing with them on the first day, I will be doing my own thing this time."