Aston Villa are understood to have held talks with Borussia Dortmund goalkeeper Roman Weidenfeller.
German sources claim that Houllier has already spoken with the 30-year-old, who is out-of-contract in the summer.
Because his deal is due to expire at the end of the season, there is nothing preventing any club from outside the Bundesliga holding talks with Weidenfeller.
Now the keeper admits he is considering his options because his next deal will be the 'most important' of his career.
"This is going to be the most important deal in my whole career, this is why I am definitely sorting out all my options," he told Kicker-Sportmagazin.
"I will just sign after I have thought things over. Of course, I do not want to delay a decision for weeks or months.
"But if I am staying on, I will not sign for one or two more years. I want to be a part of Borussia (Dortmund) for longer than that.
"I am not the kind of guy that joins a club where he is to be cut off from the outside world. This would not be me playing then."
Weidenfeller has been with Dortmund since 2002 and became first-choice the following year when Jens Lehmann departed for Arsenal.
