Real Madrid's two midfielders could face consequences for their altercation. Federico Valverde was taken to hospital with a head injury after an alleged dressing room incident with Real Madrid team-mate Aurelien Tchouameni, just three days before they face a crunch title match against rivals Barcelona.

Real later said in a statement they had opened disciplinary proceedings against the pair "following the incidents that occurred this morning during the first team's training session." The club also confirmed Valverde has been diagnosed with a cranioencephalic trauma, a type of concussion.

"Valverde is at home in good condition and will have to remain at rest for 10 to 14 days, as indicated by the medical protocols for this diagnosis," they added. Sources have told BBC Sport that Uruguayan midfielder Valverde was knocked unconscious in an altercation, while ESPN has reported that he needed stitches.

Tensions between the two players reportedly started during Wednesday's training session. Although their argument is said to have continued into the dressing room, it did not go further at that point. Thursday's alleged altercation is widely reported to have taken place after training at the club's Valdebebas base, when France international Tchouameni is said to have confronted Valverde and a verbal argument turned physical.

An emergency meeting was called for Thursday evening with Real president Florentino Perez and his staff, plus head coach Alvaro Arbeloa and club captain Dani Carvajal. In their statement, Real added: "The club will provide updates on the resolutions of both proceedings once the corresponding internal procedures have been completed."

BBC Sport has contacted the club and the players' agents for comment. Real face Barcelona in El Clasico at the Nou Camp on Sunday. Anything other than a win for Real would hand their rivals a second consecutive La Liga title, with three games to spare.

Spanish media say the incident has been described internally by several members of staff as "the most serious ever experienced in Valdebebas." Reports of tension between Valverde and Tchouameni follow claims of other disagreements in the Real Madrid dressing room.

Earlier in the week, Spaniard Alvaro Carreras responded to numerous reports that he had an altercation with Germany's Antonio Rudiger. Left-back Carreras did not specify which player he was referring to when he posted a statement on Instagram that read: "In recent days, certain insinuations and comments about me have emerged that do not correspond to reality.

"My commitment to this club and to the coaches I have had has been complete from day one, and it will continue to be so. Since I returned [after spells at Manchester United and Benfica], I have always worked with the utmost professionalism, respect and dedication. I have fought very hard to fulfil my dream of returning home.

"Regarding the incident with a colleague, it is a specific matter of no relevance that has already been settled. My relationship with the whole team is very good."

Supporters have also showed their discontent with star striker Kylian Mbappe this week, after he spent some recovery time in Sardinia with his girlfriend.