Atletico Madrid president Enrique Cerezo has called a move for Cristiano Ronaldo "practically impossible" as the forward looks to force a move away from Manchester United.

Ronaldo, 37, held talks at United's training ground on Tuesday -- accompanied by agent Jorge Mendes -- after missing the club's preseason tour of Thailand and Australia, citing personal reasons.

ESPN reported earlier this month that the Portugal international had handed in a transfer request due to his desire to play in the Champions League, with Atletico linked as a possible destination.

"I've said it many times. I don't know who invented the story about Cristiano. But I'll tell you, it's practically impossible for him to come to Atletico Madrid," Cerezo told reporters on Tuesday.