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Dover captain Ryan Hanson underwent emergency surgery for a "non-football-related" condition on Monday evening, the club have announced.
Hanson, appointed as the National League club's new skipper at the start of February after Sam Wood's departure, was initially taken ill at home.
A club statement read: "The 21-year-old midfielder was taken ill at home before being taken by ambulance to Ashford’s William Harvey Hospital - he was later transferred to Canterbury for surgery.
"The procedure went well and Ryan, who faces up to three weeks out, is now resting and recuperating at home with his family.
"Needless to say, everyone at the club sends Ryan their best wishes for a full and speedy recovery."
Hanson, playing for his home-town club, had played the full 90 minutes during Dover's 3-1 home loss to Grimsby on Saturday.
He joined the club on a permanent basis last summer after a loan spell with Whites from Hull during the 2020/21 season.
Hanson has made 22 starts for Dover this season, beginning every game since the end of October after a knee injury restricted his involvement at the start of the campaign. He has scored two goals - at Southend and Woking - in their 2021/22 season.