Atletico Madrid goalkeeper Jan Oblak could not remember what happened and will be kept under observation after being "slightly concussed" in Saturday's 1-0 LaLiga win over Athletic Bilbao.

Oblak was taken off in the 69th minute as part of a triple substitution due to an apparent shoulder issue, with his replacement Ivo Grbic making some key late saves at San Mames.

Atletico confirmed after the game that the Slovakian goalkeeper had been substituted "because he was slightly concussed, having also suffered direct trauma to his right shoulder".

Atleti head coach Diego Simeone added: "Jan didn't remember much of what had happened. I haven't talked to him, but the doctor told me that he didn't remember."

The club said Oblak underwent a neurological examination after the game without any worrying symptoms, but will be kept under observation by medical staff.

Oblak attempted to play on after initially appearing to suffer a shoulder injury before succumbing in the 69th minute.

The shot-stopper has started eight of Atletico's nine league games this term, having suffered a thigh issue in early September.