Sergio Perez admits he is unsure if he will be able to secure a deal for the 2014 season after admitting that McLaren's decision to replace him next year has left him in a 'difficult position'.

Perez confirmed in a statement issued on Wednesday evening that he will leave the team at the end of the year, with Formula Renault 3.5 title winner Kevin Magnussen widely expected to move up into a race seat to partner Jenson Button.

The decision leaves Perez with limited options given the late nature of the announcement, with many having initially expected him to be retained for a second season despite a difficult campaign.

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"Obviously the decision came very late and it puts me in a very difficult position, but this is life and I have to move forward," the Mexican said during the FOTA Fans Forum event in Austin ahead of this weekend's United States Grand Prix. "I already moved forward and that's why we decided to announce it; so I can relieve this pressure and just focus on these last two races to try to give the very best.

"If I don't find the right option for my career then maybe I will look for something else, but the aim is to look for something good with a good team that can give me the opportunity to win races."

Reiterating the points made in the statement announcing his departure, Perez insisted there were no regrets about his decision to join McLaren from Sauber, and said he had done all he could with the car that the team had provided him with.

"I can stand here and tell you that the team wasn't fair to me, but they have the decision and I really appreciate it," he said. "I will keep the best from the team which is a great family and I have no regrets.

"I always tried to look after the team. I think there were situations this year when the team was under so much pressure because we are McLaren, we have one of the biggest budgets and with the season we've just had you can imagine the amount of pressure. So it was pressure on me, on Jenson, on Martin, on everyone at the team.

"I think the most important thing was for everyone to be together and I think we did pretty well. We all as a team - it's what makes me feel proud of my team - we always stayed together and I think that was crucial for such a difficult year."