Following the Italian Grand Prix in which Perez finished second to team-mate Max Verstappen, Marko suggested the Mexican driver's inconsistent form was due to his ethnicity.
Marko told Red Bull's own Servus TV channel: "We know that he has problems in qualifying, he has fluctuations in form. He is South American [sic] and he is just not as completely focused in his head as Max [Verstappen] is or as Sebastian [Vettel]."
