The Hibernian forward's impressive performances have earned him a recall to the national team squad for their friendly in Japan on October 10.
Riordan's only previous cap was against Austria back in 2005 and, while admitting the player deserves another chance, Burley says he still has to prove himself at international level.
"Being a proven goalscorer in the SPL could mean nothing," he said. "We are talking about international football, we are talking about playing against the best players in the world.
"So I can't afford to have players that I'm going to carry, he's got to be a team player as well.
"If he does well in training and has the right attitude, he might get the opportunity.
"He deserves to be in the squad for what he has done this season, which is great, and hopefully he can follow that on."
He added: "Derek's got phenomenal talent and maybe he hasn't made the most of that over the years.
"He's got to realise you don't get into national squads by just scoring a few goals, you've got to be a team player.
"Hopefully with Derek the penny has dropped and he will utilise that ability.
"We have given him the opportunity. There are other talented players there but he deserves it and hopefully he realises there is more to football than just scoring goals, you have to work as a team."