The 23 year old Killybegs man play came off the bench in the 81st minute and helped the Toffees hold out for a famous opening day win.
Giles says he expects Coleman to make an even bigger impact throughout the course of the season.
He told NewsTalk Radio today of his views here:
http://www.newstalk.ie/2012/sport/giles-praises-donegals-seamus-coleman-in-evertons-1-0-win-over-united/
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