Wigan have announced Uwe Rosler as their new manager after agreeing compensation with Brentford.
Marseille have parted company with manager Elie Baup in the wake of Friday's defeat to Nantes at the Stade Velodrome.
The 26-year-old has shone for the Canaries in their rise to the top flight and has become a regular in Roy Hodgson's England squad.
However, Ruddy faces a substantial period out of action after being forced off with a thigh injury eight minutes from the end of Saturday's 1-1 draw with Everton.
A post on Norwich's official Twitter account said: "City can confirm 'keeper @Johnruddy86 has a thigh injury which is being assessed, but he could be out for approximately 3 months."
The club's confirmation followed a tweet from Ruddy himself, revealing he will go under the knife this weekend.
The goalkeeper, @Johnruddy26, said: ''Just to update everyone on my injury, unfortunately I have torn my thigh will be having surgery on saturday and out for up to 3 months, :(''
It is a huge blow for in-form Norwich, who are unbeaten in their six Premier League matches heading into tonight's match at Southampton, where Mark Bunn deputised for Ruddy.