But the former Liverpool boss insists there is nothing to worry about and it is only a matter of time before he puts pen to paper. Houllier finally takes charge of Villa for the first time in Wednesday night's Carling Cup clash with Blackburn after agreeing to become Martin O'Neill's successor nearly two weeks ago.
When asked if he had signed the contract, Houllier said: "No, not yet but it is okay. The word is more important than the rest. You mean physically? No, but don't be worried."
He added: "This is not important - I think at Liverpool, I didn't sign until November or December."
Meanwhile, Houllier has insisted he has complete faith in Kevin MacDonald, who was caretaker boss for the opening seven games of the season.
MacDonald declined the opportunity to be part of Houllier's first-team backroom staff and will revert to his role as reserve team coach.
Houllier said: "I understand why he didn't want to be there. Let's be honest, he was a bit disappointed because he was interviewed like the others.
"But I trusted him to be my number two and I trust him to be the reserve coach which, to me, is someone you work with all the time. He is part of my staff."
Source: PA
Source: PA