Toro Rosso say it's standard procedure, but reserve role at the top team could be on the cards.
Max Verstappen could be moving towards a role as reserve driver for Red Bull's premier F1 team.
The 17-year-old Dutchman, whose grand prix debut this year is controversial due to his age and inexperience, will line up on the Melbourne grid for the first time next month with Toro Rosso.
It has emerged that, while in Barcelona this week for the final pre-season test, Verstappen will stop by the Red Bull Racing garage to have a seat fitting.
A spokesman for Toro Rosso emphasised, however, that it is a normal procedure for the Faenza-based team's drivers.
Verstappen's father, former F1 driver Jos, confirmed on Max's official website: "A seat fitting is really nothing special.
"In this case it is a standard procedure for Toro Rosso drivers.
"It is intended in the event of Max doing demonstrations or show-runs in the future in a Red Bull car.
"Or - and let's hope not - in the case that one of the regular Red Bull drivers needs to be replaced. That's all," Verstappen added.