Fleck, who plays for Sheffield United, was unlikely to be in the starting lineup when Scotland opens on June 14 against the Czech Republic in Glasgow.
Scotland is preparing for its first finals tournament since the 1998 World Cup and will have two home games at Hampden Park against the Czechs and Croatia. The Scots’ other Group D game is against rival England at Wembley Stadium.
Rules to control the pandemic in Scotland saw the Czech and Croatian federations cancel their training bases on Monday in Edinburgh and St. Andrews, respectively.
Both teams will now train in their home countries and fly to Britain for games.
Euro 2020 kicks off June 11 when Italy hosts Turkey in Rome.
More AP soccer: https://apnews.com/hub/soccer and https://twitter.com/AP_Sports