The 27-year-old Spain international clashed heads with Real Madrid’s Aurelien Tchouameni in stoppage time of the 1-1 draw at the Metropolitano.

He received treatment on the pitch and the club confirmed he has since undergone “a series of tests and was assessed by specialists”.

It has been determined that he suffered a traumatic brain injury with subdural haematoma, bleeding caused by a burst blood vessel near the brain.

Le Normand will now follow “the guidelines set out in the protocol established for this type of trauma”, Atletico said, before he can return to action.

The centre-back was part of the Spain side that won Euro 2024 and started the final against England in Berlin.

He joined Atletico from fellow La Liga side Real Sociedad in the summer.

The 27-year-old centre-back helped his country win Euro 2024 in Germany this summer.

Atletico said the move will be “formalised in the coming days when the player returns from the holidays”.

Real Sociedad also confirmed the deal with La Liga rivals Atletico for a player who helped them win the Copa del Rey in 2021.

“Robin arrived at Zubieta in 2016 and, after two seasons with Sanse, he debuted in the third season and steadily secured a spot in the first team,” said Real Sociedad.

“His progress has been outstanding, culminating in 221 official matches for the txuri urdin and a Copa del Rey title.

“We will always remember his dedication and gratitude to the colours that have shaped him into the player he is today.”