Félix, the star forward of Atletico Madrid, has suffered a knee injury that will keep him out for at least one month.
The 26-year-old was replaced in the 74th minute of Sunday's La Liga match against Real Betis and will be assessed by the medical staff on Monday.
It is believed that Félix suffered a ligament injury to his left knee during the game and will undergo further tests to determine the extent of the damage.
The news comes as a major blow for Atletico, who were looking to extend their lead at the top of the table with victory over Betis.
The loss of Félix could also have implications for the rest of the team, as he is one of their most important players.
The club's manager Diego Simeone has been left frustrated by the injury and has expressed his disappointment at the setback.
However, he has praised Félix's character and determination, saying: "He's a fighter and we'll support him throughout this difficult time."
For now, it seems that Atletico will have to rely on other players to step up and fill the void left by Félix's absence.
But it is clear that the team will need to work hard if they want to maintain their position at the top of the league.