The 26-year-old Dunk will report on Monday with the rest of Gareth Southgate's youthful 25-man squad.
England, who are second in Group A4, face third-placed Croatia in Rijeka on Friday before taking on leaders Spain in Seville the following Monday.
Dunk's only previous international call-up was for the Under-21 squad when he was an unused substitute in a 5-0 win over Iceland in November 2011.
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(Writing by Ken Ferris; Editing by Clare Fallon)
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