Not a huge surprise.
http://www.guardian.co.uk/football/2009/nov/21/sam-allardyce-chest-surgery-blackburn
The Blackburn manager Sam Allardyce will miss the next three Premier League matches as he is to undergo surgery after suffering "chest discomfort."
The Rovers boss will be absent from tomorrow's game against his former club Bolton, the midweek fixture at Fulham, and the match against Stoke at Ewood Park next weekend.
The 55-year-old is having an angioplasty, a procedure which will widen one of his coronary arteries.
A statement on the club's website said Allardyce "has recently complained of brief episodes of chest discomfort and investigations have revealed a narrowing to one branch of his coronary arteries. Sam will next week undergo an angioplasty with the insertion of a stent to correct this narrowing."
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 in his absence.
http://www.guardian.co.uk/football/2009/nov/21/sam-allardyce-chest-surgery-blackburn