Sergio Perez has hit out at McLaren amidst ongoing speculation about his future, saying that the team 'lacked organization and humility to accept reality'.

The Mexican seems almost certain to leave the team at the end of the year following reports that Kevin Magnussen will join Jenson Button in the second race seat for the 2014 campaign.

Perez has endured a difficult season this year after making the move from Sauber, with an uncompetitive car preventing him from making much of an impression on-track.

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With huge question marks now being raised over his future, Perez admitted he was disappointed by the way his time at McLaren had panned out this year.

"I'm very disappointed," he was quoted by TotalRace. "I believe that when your goals are much higher than their results, you get disappointed, and that goes for both parties.

"I have no doubt that it's a great team and has a lot of very capable people, but I think it lacked organization and a little humility to face reality this season. During the season, McLaren took a long time to see the reality of the situation we were in, which was to score points on a good weekend and not to win races. The team took to realise it."

Despite his disappointment with the results on track, Perez had only positive things to say about team boss Martin Whitmarsh.

"I think Martin is a great leader," he said, "I have nothing bad to say about him. He is a great leader and led the team in a good way. But a team does not depend on a team principal, it depends on many things that were not good enough and this is especially true this year."