Hearts have confirmed that manager Craig Levein is recovering after being taken to hospital.
In a statement published on their official website on Monday, the club said the 53-year-old "received medical treatment" after his admittance.
It continued: "No further comment will be made at this time and the club asks that Craig and his family's privacy be respected, as we all wish him a speedy recovery."
Hearts' Edinburgh rivals Hibernian took to Twitter to post their support, saying: "We're glad to hear that he is doing okay, hopefully it is a speedy recovery. Get well soon, Craig!"
Levein took charge at Tynecastle a year ago, having previously held the post of director of football for three years.
Hearts finished sixth in the Scottish Premiership last season, but have made a perfect start to the new campaign, winning all three of their league games as well as a League Cup victory over Dunfermline Athletic.