Pop-star George Michael was taken to hospital by ambulance after collapsing at his Highgate home last Thursday morning.
Two ambulances were called to Mr Michael's aid by a worried friend at 8am. They then took him to an unnamed London hospital.
His agent told The Sun newspaper: “George Michael was in hospital for routine tests but there is nothing further to say.”
A London Ambulance Service spokesman said: “We were called just before 8am on May 22. We sent two ambulance crews and staff treated one patient, a man, who was taken to hospital.”
The incident follows Mr Michael's pneumonia health scare in 2011, when he made an emotional speech to fans outside his home after undergoing an emergency tracheotomy.
In May 2013 he was airlifted to hospital after falling out of a moving car on the motorway.