"He's earned the right," Armstrong recently told the St. Louis Post-Dispatch. "He will be one of two. I view Jake Allen coming in here next year competing for starts."
It has been widely reported that Miller's preference is to play as close to his off-season home in California as possible, prompting speculation that he could pursue a contract with the Anaheim Ducks or San Jose Sharks this summer.
"It's a two-way street with Ryan at this time," Armstrong said. "I want to get his feelings about our organization, how he felt about coming in, where he thinks we're at ... see if he even has any interest being a St. Louis Blue."
If Miller decides to walk, the Blues could turn to Elliott and try to re-sign him this summer.
Elliott's numbers have been extremely solid during his time in St. Louis and the Blues could form a goaltending tandem of Allen and Elliott next season.