Jean-Eric Vergne will start this season with a new race engineer after Phil Charles was promoted to chief engineer at Toro Rosso.
Vergne, who has spent the last week working on a pre-season fitness training programme in the French Alps, has worked with Charles since joining Toro Rosso.
However, this season the Frenchman will be under the guidance of Francisco Javier Pujolar, who previously worked at HRT and more recently at Williams.
"This week is the first time I have worked with my new trainer, Juuso," Vergne 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!
"There have been other changes to the professional group around me, including the fact 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."
The 23-year-old also spoke of his fitness programme, which came in the wake of some down time with family and friends.
"I spent the holiday time with my family and friends and now we are here for some serious training over a two week period.
"I love being in the mountains and, although the plan involves quite a lot of gym work, it's the outside stuff I love, like snowshoe walking, climbing mountains, and cross-country skiing.
"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.
"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."