Blackburn Rovers manager Sam Allardyce has been told he needs to have surgery on a coronary artery and will miss his team's next three matches while he recuperates.
He will miss Sunday's game against his former club Bolton Wanderers as well as the Premier League clash at Fulham and the home encounter with Stoke City.
However, he is expected to be ready to return to take charge of next month's Carling Cup quarter-final with Chelsea.
Allardyce recently complained of chest discomfort and investigations have revealed a narrowing to one branch of his coronary arteries.
Rovers chairman John Williams said:"Sam is very disappointed, particularly at missing the Bolton fixture, but his well-being is of prime consideration.
"We all appreciate that Premier League football is a stressful business and prevention is always better than cure."
Assistant manager Neil McDonald will take charge of first-team affairs in 55-year-old Allardyce's absence.