Sebastian Vettel has spent more time with what David Coulthard has labelled his "comfort blanket" of his old colleagues at Red Bull, in the time that his title hopes have all but disappeared. The Scot also suggested that Vettel has become unhappy with life at the Scuderia.
Over the course of the season, Vettel has seen his hopes of a fifth world title disappear due to a few costly mistakes, coupled with some stellar drives from his rival Hamilton. He is on a five-race winless streak, with his best result being third in Russia and Singapore.
Starting from fifth on the grid in the US, he should have been in contention for a podium, if not a race win, but thanks to a first lap incident with Ricciardo, Vettel dropped to 14th and had to carry out yet another recovery drive, something which he said after the race he is "tired" of having to do.
Coulthard believes that the problems that Vettel is facing are not only caused by the the pressure of the world championship, but from deeper concerns that he has with his team.
He told Channel 4: "He's a four time world champion, he's made two mistakes in two corners, one mistake you can say you're finding where the car is. He says he's tired - when you're tired you go for your comfort blanket. I've seen him around Red Bull more often in the last few races than at any other time that he's been at Ferrari.
"So he's not knuckling down with his comfort blanket at Ferrari. To me it looks like he's not only tired of the recovery drives, he's just not as happy within the team as he was at Red Bull."
Bahrain International Circuit - Winter testing