Marko's warning to Perez: 'If performance isn't good, contract is useless'

Sergio Perez's future is once again in the limelight after the United States Grand Prix, and Red Bull's chief advisor Helmut Marko has sent the Mexican another warning. If 'Checo's' performance isn't good, he will not remain in the Red Bull seat. In the recent Autumn break, rumours were circling that Perez would announce his retirement at the upcoming Mexican Grand Prix weekend. The home hero will be hoping to impress not only the fans, but also his own team.