The Vancouver Whitecaps forward is not due back to the MLS club until March and he has admitted that a return to his home nation is a possibility.
"There are a lot of hurdles to be crossed for it to happen and it's something I've not thought too much about," Miller told Sky Sports News.
"But I'm not too keen to take time off, so if something came up I'd look into it. It's a long time until our season starts again, so I'll be going on loan or doing some training somewhere. It's a case of trying to find somewhere willing to take you where you're going to get games."
Miller has also played for Celtic.