French (?) film from at least 1990 starring a giant rat!

A friend of mine intrigued me with his vague memory of a film he saw. All I know is there is a guy who is bitten by a rat and he turns into a giant rat (the size of a sofa). I think the film was French and it was certainly made before 1990 as it has been at least 25 years since he saw it. I want to know what it is so I can track it down and see it. Playse Halp!

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