With rain falling overnight and throughout the morning, it was Gasly who splashed his way to the top of the timesheets as he headed the Red Bull pair of Max Verstappen and Sergio Perez

The Frenchman posted his fastest lap on intermediate tyres with the track rapidly drying out in the closing stages of FP3 to end up 0.164s clear of Verstappen and over two-tenths up on Perez. 

Championship leader Lewis Hamilton only completed five laps and ran when conditions were much wetter on his way to finishing a lowly 18th and over three seconds down. 

Carlos Sainz initially set the pace during the early running on wet tyres and ended up fourth, almost three-tenths clear of Ferrari teammate Charles Leclerc, who was among a number of drivers to be caught out at Turn 9.

Alpine driver Fernando Alonso survived a wide moment at Turn 1 on his way to taking sixth, ahead of Alfa Romeo’s Kimi Raikkonen and the AlphaTauri of Yuki Tsunoda, who ended up 1.5s down on his teammate’s benchmark. 

Valtteri Bottas and Esteban Ocon completed the rest of the top 10 for Mercedes and Alpine. 

Mick Schumacher popped his Haas into 13th ahead of the McLaren pair of Daniel Ricciardo and Lando Norris, while the Williams duo of Nicholas Latifi and George Russell completed just 10 laps between them as they finished slowest of all. 

Mercedes-bound Russell was the only driver who failed to set a lap time after beaching his Williams in the gravel having aquaplaned off at Turn 2.

Conditions are forecast to be dry for qualifying, which gets underway at 3pm local time (1pm BST).

Full final practice results at the 2021 F1 Turkish Grand Prix.