The actor's character Karl Munro and Rovers barmaid Sunita Alahan are currently enjoying a fling, betraying their respective partners Stella and Dev.
Michie has now told Inside Soap that he expects an explosive reaction when Stella discovers the truth.
He commented: "When Stella finds out about the affair, she's going to want to kill Karl. It would probably be treated as a crime of passion, too! Stella has put a lot of faith in Karl, so that total abuse of trust will completely devastate her.
"As an actor, I'm looking forward to the moment when she does find out, whichever way it ends up being written. There's very little doubt that the sparks will start flying."
Michie also confirmed that Karl will be on good terms with Stella's mum Gloria, played by Sue Johnston, when she joins Weatherfield in the coming weeks.
He said: "Karl actually gets on with Gloria really well. She also quite likes him, and they have good banter. But she'll surely hate him if he hurts her daughter in any way."
Watch a preview of Thursday's (May 17) Coronation Street episode in the video below: