On Thursday morning it was announced that Verstappen would be joining Red Bull in a swap deal with Daniil Kvyat, who would be returning to the outfit with which he made his F1 debut.

But sources have revealed that over the course of the day, decisions have been made for a reshuffling of the engineering staff at Faenza too. The moves are believed to include Pujolar and Verstappen's data engineer Olivier Helvig, who are set to leave their positions.

Toro Rosso declined to comment on the situation when asked for a response on Thursday night, but the potential departure of the pair comes after reports of an argument between engineering staff and team principal Franz Tost following qualifying at last weekend's Russian Grand Prix.

While it would have been logical for Verstappen to have taken Pujolar and Helvig to Red Bull with him, the Milton Keynes-based team has confirmed that the Dutchman would be using Kvyat's former engineering staff, including race engineer Gianpiero Lambiase.

It is therefore likely that Pujolar and Helvig will therefore be leaving the team, although there has been no official confirmation of the news.

Before joining Toro Rosso, Pujolar had worked as a senior engineer at Jaguar, HRT and Williams.