Philippe Clement indicated City must now weigh up whether to make a transfer window move before Monday's deadline, given that fellow central midfielder Mirko Topic is already out for the season with an ACL knee injury. The Belgian confirmed on Friday that Mattsson did not require surgery for an ankle problem that forced him off at half-time against Coventry, but is ruled out for what was described as several weeks. The 24-year-old Danish midfielder joined Norwich City in August 2025 and is under contract until June 2028. He has made 22 appearances in the Championship this season, and Transfermarkt estimates his current market value to be €3.00m.