But it is the selection of Colwill, who began the season playing academy football and did not make his senior Cardiff debut until February, that will raise the eyebrows.
Neath-born Colwill has made just six Cardiff appearances, with just over three hours under his belt in the Championship for Mick McCarthy’s Bluebirds. The teenager has not yet stepped out for his country at senior level.
As expected, Hal Robson-Kanu – released by West Brom last week – missed out after being left out of the recent training camp.
Robert Page, Wales’ caretaker manager, is set to lead the side this summer, with head coach Ryan Giggs due to face trial next year after being accused of deliberately headbutting his ex-girlfriend and controlling her throughout their relationship.