 In May 2010, it was identified that Morison was eligible to represent Wales due to Welsh ancestry – as his grandmother was born in Tredegar, near Ebbw Vale.Wales assistant manager Roy Evans was present to watch Morison in Millwall's 1–0 victory against Swindon Town, while Morison "registered his interest" in representing Wales.In July 2010, Wales boss John Toshack named Morison in the Wales squad for a friendly against Luxembourg in Llanelli on 11 August 2010.