Each goalie will be playing one full game between now and the end of training camp to battle for the position.
Ramo was acquired and signed with the idea that he'd replace Miikka Kiprusoff as the Flames' No. 1 goalie, but that's not set in stone.
"It's not my decision -- it's not anything I have to think about," Ramo told the Sun. "It's the guys upstairs and the coaching staff who thinks about who they feel the most comfortable with. You just want to do your best every day, so hopefully, they're going to choose you and give trust to you."
While Ramo shined in the KHL, becoming a two-time All-Star, many question his ability to perform at that same level in the NHL, which boasts a very different style of place on a smaller ice surface.
"They're all in the same boat right now," Hartley added. "I can't say that one is ahead of the other. It's a three-man battle."
If the Flames find that none of their current goalies are capable of handling the starter's job this season, GM Jay Feaster could go out and trade for one.
A deal isn't imminent, as the Flames aren't exploring that option right now, but if all three goalies struggle, Feaster will be on the lookout.