Ajax defender Daley Blind is "feeling well" and will undergo further tests following a health scare on Tuesday, his club have confirmed.
The former Manchester United defender is said to have collapsed before being substituted during a friendly match with Hertha Berlin.
Blind was fitted with a subcutaneous implantable cardioverter defibrillator, a device that monitors and regulates his heart rhythm, after being diagnosed with heart muscle inflammation following a Champions League game with Valencia last December.
Ajax coach Erik ten Haag confirmed that there was an alert sent by Blind's ICD as he fell to the pitch during the Hertha match.