FORMULA ONE star Sergio Perez is at risk of losing his spot on the grid after a disastrous home Grand Prix.
The 34-year-old was out to end his six-month podium drought in Mexico but came 17th.
Perez's Red Bull car struggled with braking problems, with reports suggesting that his poor year could see him axed in the final four races of the season.
Asked about Checo's future, team principal Christian Horner said: "Look, it's a performance based business. There comes a point in time that difficult decisions have to be made."
His comments come after chief Helmut Marko added: "The hoped for upturn that we all expected has unfortunately not materialised.
"Perez may have a contract, but F1 is a meritocracy. If the performance is not right, even contracts are useless."
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Max Verstappen could soon have a new team-mate, with Liam Lawson rumoured to be in the running.
The New Zealander has impressed for RB in recent weeks, who are the team owned by Red Bull.
Lawson came to blows with Perez in Mexico after a controversial overtake saw them go wheel-to-wheel.
Perez raged about him post-race, saying: "I think the way he has come to F1, I don’t think he has the right attitude for it. He needs to be a bit more humble.
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"When you come to F1, you’re obviously very, very hungry and so on, but you have to be as well respectful off track and on track.
"I don’t think he’s showing the right attitude to show a good case for himself.
"I think he’s a great driver and I hope for him that he can step back and learn from it.
“In his two first Grands Prix, he has had too many incidents. I think there will be a point where it can cost him too much."