The Cardiff City star has been in doubt all week with a groin injury but is planning to defy doctors orders to make himself available for the important clash which could put the Scots on the brink of qualification for next summer's tournament in Poland and Ukraine.
Levein suggests that Miller will only need to prove his fitness to gain a start and be handed the captains armband for their penultimate Group I fixture before reassessing for the trip to Spain on Tuesday.
"In all honesty, at this minute in time the only game I'm concerned about is the first one," Levein said.
"I'll worry about Spain later because if we don't win the first one and get ourselves in pole position then it doesn't matter if he's available or not for the game in Spain.
"I'd like to play the best team possible against Liechtenstein and then we'll deal with whatever problems we have after that.
"Basically, if Kenny can prove his fitness tomorrow he will play. He's improving. He hasn't trained with us yet but I expect him to do some training tomorrow. "That's what I'm hearing from the doc at the moment anyway - that his progress has been really good.
"I've had a couple of brief chats with Kenny in passing and he tells me he's feeling okay. But I won't make a decision until I find out how he is in training tomorrow and see his reaction to the training. But I'm certainly more positive about him than at the beginning of the week."