Mike played off the bench in the Warriors' 32-10 win over Ulster on Saturday, and he hopes to be involved against the same opposition in Friday's Scotstoun semi-final.
Speaking to BBC Scotland, Mike said: "It's been rather frustrating the last couple of years, but it's definitely nice to be back the last few weeks.
"It's been a bit of a struggle occasionally, getting a few niggles on the way, but certainly good to be back playing in a semi-final.
"The conditioners have looked after me a lot; I've done a lot of work with the physios just to get back ready to play rugby again. It's been a long time for two years with not playing any rugby at all."
Mike return is timely as he will be in the mix for selection in Scotland's Rugby World Cup squad.