Fernando Torres took a sicking blow to the head during Atletico Madrid's 1-1 draw at Deportivo de la Coruna.
The striker was crashed into by Alex Bergantinos, falling to the ground and striking his head against the floor.
He was taken from the field on a stretcher unconscious before being moved to hospital where he awoke and stabilised.
Tests showed he had no neck or back injuries and he will be kept overnight for observation as a precaution before being allowed home on Friday after further tests.
"A cranial and cervical CT scan carried out on Fernando Torres has ruled out that the Rojiblanco striker has suffered any alterations or traumatic injuries," Atletico said in a statement.
"Our player, who is stable, conscious and oriented, had to be removed by ambulance after being stabilised according to the usual protocol, before entering the Model Hospital of La Coruna, where he will spend the night in observation."
Atletico needed an Antoine Griezmann screamer to rescue them a point after Deportivo opened the scoring through Florin Andone, after Jan Oblak's poor goalkick was not reached by Jose Maria Gimenez, with the forward racing onto the ball and slotting home.
PARTE MÉDICO@Torres sufre un traumatismo craneoencefálico. Fue trasladado al hospital para hacerle pruebas. Pasará la noche en observación.— Atlético de Madrid (@Atleti) 2 de marzo de 2017