Jean-Eric Vergne is determined to remain in F1 next season, having seen his seat at Toro Rosso handed to teen sensation Max Verstappen.

The young Dutchman was confirmed as team-mate to Daniil Kvyat late on Monday night, leaving Vergne out in the cold after three seasons in the top flight. Having seen former STR partner Daniel Ricciardo promoted to the Red Bull Racing line-up - and winning races in 2014 - it is a particular blow for the Vergne, who matched up well to the Australian in their time together, but he insists that he is not done with F1.

"Toro Rosso is a good school. I learnt a lot," he wrote on his Twitter feed, "Now focused on a great end of season. I'm already working for 2015. Still a lot to show in F1."

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Vergne's 2014 campaign has been hit by poor reliability, restricting him to just four point-scoring finishes despite some stellar qualifying performances. The Frenchman currently edges the highly-rated Kvyat 6-5 in qualifying, having been a regular in the top ten on Saturday afternoons, and leads the reigning GP3 Series champion 11-6 in terms of points, but faces an uncertain future outside of the Red Bull umbrella.

While Kvyat at Verstappen look set to form the youngest pairing in F1 next season, STR team boss Franz Tost admits that he is hoping for better reliability for 24-year old Vergne over the remaining eight races as he attempts to find a drive for next year.

"[Jean-Eric] has produced strong performances, but unfortunately he was also hindered by some reliability problems, especially in the first half of the current season," Tost acknowledged, "We hope that we have resolved these problems and that he will be able to end the second half of this season on a high note and thereby show that he still deserves another opportunity in F1."

The 2015 F1 field remains fluid, with some of the sport's bigger names yet to confirm where they will be lining up and, as a result, delaying the knock-on effect that shapes the rest of the grid.

Verstappen's signing is also bad news for Carlos Sainz Jr, the Spaniard having previously been tipped to graduate to a Toro Rosso seat next season. Sainz currently leads the Formula Renault 3.5 standings, but may have to look for a testing role to be involved in F1 next season.