Shane Duffy had a "tough time" at Celtic after the defender's loan spell was cut short. The Parkhead club paid around £2million to take the Ireland international on loan, with reported wages of £30,000 per week.
Duffy scored in his first two appearances but struggled badly thereafter. He was criticised for his performances in big games against Sparta Prague and Rangers, and the centre-back hasn't featured since February.
An injury ended his season early and Duffy has returned to Brighton, with his manager admitting the loan to Celtic proved difficult.
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