The Aston Villa manager remains in hospital after complaining of chest pains last week, and although he is nearing the point where he can return home, there remain serious doubts about whether he will return to work with assistant Gary McAllister taking control of team affairs until the end of the season.
Houllier, 63, has suffered from heart problems before, needing five months out of the game while in charge of Liverpool in 2001.
Dr Duncan Dymond, who works with Chelsea, told TalkSport on Thursday morning that Houllier would be best advised to retire.
"My own assessment, without knowing Gerard Houllier or having seen him, quite frankly he's had one brush with the grim reaper already and now's he had one serious warning, and to put himself through this again with the stresses and strains of being a football manager, I think he should call it a day," Dymond said.
Source: PA
Source: PA