Sebastian Vettel had every reason to be unhappy after the Malaysia GP.
The Ferrari driver accused Fernando Alonso of "jumping in the middle" of his battle with Daniel Ricciardo for the last race's podium.
Vettel seemed to be closing down on Ricciardo when blue flags were waved for Alonso in Lap 48. But, while Alonso allowed the Red Bull driver to overtake him easily, Vettel was stuck behind him until Turn Four.
As a result, Vettel lost crucial time to Ricciardo and did not manage to overtake him afterwards. The championship's runner-up performed a great drive from the back, but only managed to finish fourth.
The Ferrari driver was far from happy about Alonso's behavior, expressing his dismay during the race.
"Come on Alonso," Vettel exclaimed over team radio. "I thought you were better than that!"
Vettel continued to criticise Alonso after the race, explaining what happened according to him.
"Fernando decided to jump in the middle. I think he said when he left Ferrari that he was a Ferrari fan but today he didn't act like one."
You can listen to Vettel on his team radio in the clip below.
In relation to the incident, the two-time world champion explained to Sky F1: "For me it looks OK but we've heard 'blue flags, blue flags' from him before so it was just one of those."
Vettel's problem with Alonso was not the only one for the German driver.
During the in-lap, he was involved in a post-race crash with Lance Stroll. Although the two of them were not punished by the stewards, Vettel faces a five-place grid penalty for Japan as his gearbox seemed torn to pieces.
Apart from that, Max Verstappen celebrated his 20th birthday weekend by winning the race. A confident performance put him in front of Lewis Hamilton, with teammate Daniel Ricciardo completing the top three.
Stoffel Vandoorne finished 7th in Sepang, in which he calls his "best ever F1 drive". Alonso, on the other hand, struggled to 11th after a disappointing start behind the Williams.