Manchester United defender Harry Maguire faces a spell on the sidelines with a torn a muscle in his hip, sources have told ESPN.
Maguire picked up the injury during the goalless draw with Wolves on Saturday and he missed the Carabao Cup defeat to Manchester City on Tuesday.
Despite leaving Molineux in some discomfort, manager Ole Gunnar Solskjaer was initially hopeful Maguire might be able to feature against City and the 26-year-old was included in the preliminary squad which met at the Lowry Hotel on the day of the game.
But scans have revealed the England international has suffered a muscle tear and he has already been ruled out of Norwich's visit to Old Trafford on Saturday and the FA Cup replay with Wolves on Wednesday.
It is a further blow to Solskjaer, who is already without midfielders Paul Pogba and Scott McTominay.
Maguire's absence also leaves the Norwegian short in the centre of defence. Marcos Rojo and Axel Tuanzebe are also injured and Eric Bailly has only just returned to training following more than five months out with a knee injury.