The former Scotland Under-21 international, who set up the first and scored the winner on Saturday against Craig Brewsters Inverness Caledonian Thistle, has been rewarded with a call-up to the squad for the match against Germany in Mannheim next week.
Riordan said: "I was disappointed not to be included in the squad in the first place, but delighted I’ve now been included. I am looking forward to teaming up with my club team mates Garry O’Connor and Ian Murray