Atletico Madrid has made Joao Felix, Matheus Cunha, Felipe and Mario Hermoso available on the January transfer market.

Atleti were eliminated in the group stage of the Champions League, which will hit their financial situation.

Joao Felix joined Atletico from Benfica for €127 million in July 2019 as one of the most highly rated teenagers in European football, intended as a replacement for the Barcelona-bound Antoine Griezmann.

Last week Atletico chief executive Miguel Angel Gil Marin admitted for the first time that a departure was likely.

"He's the biggest bet this club has taken in its history," he told TVE. "I personally think he's a top talent, a world class player. For reasons it isn't worth getting into -- the relationship between him and the boss [Simeone], the minutes played, his motivation right now -- it makes you think that the reasonable thing is that if there's an option that's good for the player, good for the club, we can look at it. I'd love him to stay personally, but I don't think that's the player's idea."