Grosjean and Gasly traded paint, and bits of bodywork, as they tangled at Turn 17.
Although Grosjean was on a slow-down lap, the Haas driver remained on the racing line.
That caught out Gasly, who was on a hot lap, with the Frenchman gesticulating at the Haas driver before going straight on and causing the contact between them.
Lee: "It was a bizarre ending to FP3. We had a strange incident between Grosjean and Gasly." 🤔
The two drivers tangled at Turn 17 and Karun is unimpressed with Grosjean 💥
— Channel 4 F1® (@C4F1) November 24, 2018
They were called before the stewards who ruled that no action needed to be taken.
Grosjean later went to Gasly in the Toro Rosso garage to apologise.
— Formula 1 (@F1) November 24, 2018
Meanwhile Kimi Raikkonen was handed a reprimand for his antics in qualifying, which saw him run wide and put the nose of his Ferrari into the pit lane entrance before rejoining the track.
The stewards’ ruling read: “Whilst car seven did not enter the pits, it was in the process of entering the pit lane and the pits. Therefore, a breach is considered to have occurred.
“Both offences were considered to be part of one incident so a single reprimand is imposed.”
It is Raikkonen’s first reprimand of the season.