Neil Lennon revealed that Celtic skipper Scott Brown could be out for 10 weeks following their 2-1 Champions league defeat by Benfica at the Stadium of Light.
The Hoops midfielder has been battling all season with a hip complaint, only playing intermittently and usually in the big games, but had to succumb to the pain in the second half when he was replaced by Kris Commons.
Parkhead boss Lennon said: "Scott Brown has run his course, we may have to book him in for surgery. We are looking at eight to 10 weeks."
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