Riordan had previously publicly voiced his unhappiness at being given so few first-team chances during a two-year spell with Celtic before his return to Easter Road.
And he admits that his reputation could be counting against him.
"I think it is," he said. "People say I don't work hard, but I think, since I came back here, I've worked a lot harder than I used to first time round.
"I've got the one cap, but I've had no contact from George Burley.
"I've just got to concentrate on my club football and I want to finish top scorer. That's what I want to do every season.
"I'm happy with the way things have gone for me. I'm still scoring goals."
Bookmark with:
What are these?