The German came off second best in a string of on-track battles, as the title headed to Mercedes for another season.
He also gifted Hamilton the German GP after a mistake, but Vettel had no idea why his Ferrari was constantly pirouetting throughout the year.
Arrivabene has a clever way of putting it right, but he also said that the Scuderia will be looking to bounce back in 2019.
“Maybe we will give Sebastian Vettel elbow pads to fight back better when things get tough with his rivals,” Arrivabene said.
“No, seriously – we are pursuing the same goals as Seb.
“Seb has to show his best at the wheel of a Ferrari. Of course we have to give him the foundation, with a good car and impeccable work.
“If we can do that, and he does too, then I know that Vettel will get an extra portion of performance that will help us achieve big things.”