Tottenham Hotspur manager Harry Redknapp will undergo minor heart surgery on Wednesday, according to reports.
Redknapp, 64, went to hospital on Tuesday night to undergo tests and it is suggested he will now have an operation on a minor blockage in one of his arteries.
Tottenham confirmed on Tuesday night that the former West Ham manager was set to undergo a "medical procedure'' that would rule him out of the club's trip to Rubin Kazan this week.
Assistant manager Kevin Bond and first-team coach Joe Jordan will take charge of the team for Thursday night's Europa League match in Russia.
It is not known how long Redknapp will be away from work. An update is expected later on Wednesday at the club's press conference in Russia, to preview their Europa League Group A match against Rubin Kazan.
Quoted in The Sun on Wednesday morning, however, the Spurs boss appeared confident he would be able to resume his leadership of the club in time for Sunday's Premier League game at Fulham.
Redknapp told the newspaper: "I'm hoping I can be back at work again in a couple of days.''
The former Portsmouth manager, who has been in charge of Spurs for three years, admitted in March 2010 that he had started talking heart pills upon the advice of his doctors, but stressed it was not a major problem.
Writing in his Sun column, Redknapp then said: "About a year ago I needed to take heart pills and I am still taking them regularly... I am absolutely fine and have no worries about my health but this game can make the most mild-mannered of people explode as when you are sitting on the bench you get eaten up inside from first to last whistle.''
On the stresses of management he added: "After a game I cannot sleep, there is too much going on in my head as I go over moves, think about game plans, think about which player has had a good or bad game - and it's worse if you lose.''
Redknapp is not the first football manager in recent times to have undergone heart surgery.
Gerard Houllier had to have an 11-hour emergency aortic dissection after experiencing heart problems at half-time during Liverpool's game against Leeds in 2001, and the Frenchman required a similar operation last season when in charge of Aston Villa.
The former Lyon manager, who like Redknapp is 64-years-old, returned to manage Liverpool after five months out, but he did not take charge of another game at Villa following his most recent heart scare and left the midlands club in the summer.
Manchester United boss Sir Alex Ferguson had a pacemaker fitted in 2004, but was back at work the following day.
West Ham boss Sam Allardyce underwent heart surgery while in charge of Blackburn in 2009, and Joe Kinnear had a triple-heart bypass earlier in the same year while at Newcastle.