Tottenham Hotspur manager Harry Redknapp could be away from the club for five weeks after his heart surgery.
The 64-year-old initially said he aimed to be back on the touchline in two weeks after the minor procedure to unblock coronary arteries.
But he told Sky News: "[The doctor is] telling me I shouldn't even think about [returning] for at least four to five weeks. I hope to be back before then."
The manager was released from hospital on Thursday.
He had two stents inserted, while the treatment is known as a coronary angioplasty and is classed as a routine procedure.
Redknapp initially predicted he would return for his side's match against Fulham, but later said he would try to remain calm while watching the game on television.
He did not travel with Tottenham to Russia for their midweek Europa League tie with Rubin Kazan - and first-team duties in his absence have been taken up by assistant manager Kevin Bond and coach Joe Jordan.
He is not the only top-flight manager to have undergone coronary angioplasty.
West Ham boss Sam Allardyce had the procedure after chest "discomfort" at the end of 2009 but returned to work with Blackburn soon afterwards, while former Liverpool boss Graeme Souness had heart surgery in 1992 but led the team out in the FA Cup final days after leaving hospital.
Manchester United boss Sir Alex Ferguson had a pacemaker fitted in 2004, but was back at work the following day.
Other managers have had more serious heart-related conditions. Joe Kinnear had a triple-heart bypass in 2009, which ended his time in charge at Newcastle, having previously suffered a heart attack during his time as Wimbledon boss.
Former Liverpool and Aston Villa boss 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.
In June a recurrence of cardiac pains saw the 63-year-old Frenchman leave Aston Villa after nine months in charge.
Speaking after the procedure, Spurs chairman Daniel Levy said: "We are delighted the operation went so smoothly and successfully. Knowing Harry he will want to rush back but it is important that he only does so when he has recovered properly."
