Marcus Ericsson admits he was left surprised by how quickly his move to Sauber was completed following Caterham's problems.

Caterham entered administration last week, with the team pulling out of the United States and Brazilian grands prix as a result. Ericsson still travelled to Austin and after just two days of being in the paddock was announced as a Sauber race driver for 2015. Speaking exclusively to Crash.net, Ericsson said nothing was agreed when he arrived in the US and the speed at which the situation had developed caught him by surprise.

"My management was speaking to different teams for a while, but after everything that happened with Caterham it went into a faster speed in the talks," Ericsson said. "I knew we were speaking to them but I wasn't expecting anything get sorted this early."

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Having been facing an uncertain future, Ericsson said the early timing of the announcement would allow him to prepare in the best possible way for 2015.

"Last year everything was sorted at the end of January, so to have it done in November is great because you start preparing yourself now and start getting to know the people you are going to work with, so to have that stability is great."

And Ericsson said he felt his performances in recent races helped convince Sauber that he could deliver for the team.

"I think it has been a big part of it. It has been a tough season for me, I have been struggling to show what I am capable of in the car because it is difficult to drive, so it has not been easy. But in the last couple of races I could start to get the car more to my liking and then I could show more of my potential, so I think that was extremely important in getting this deal for Sauber."