The judges' score cards all pointed to a unanimous decision in favour of Michael following a tactical five-round battle in the octagon on Thursday night.
Michael had very little time to prepare for Nomveve, who was announced as the new challenger, with Shadrack Nsua involved in a car crash.
Although it took him the maximum number of rounds to retain his title, Micheal said his winning formula was simple.
"To be honest, since I won the middleweight title last year, I knew that Siya Nomveve was one of the dangerous guys next in line, and I wish him and his family all the best for his recovery.
"When I watched some of Siya's fights, his takedown defence and counter wrestling looked really good, but due to my hard work and years of grappling experience, I just proved that I am a level above," explained the "young gun".
The champion added that, even with the quick turnaround, Nomveve was in fact not a closed book like he was expecting.
Michael dedicated the win to his wife, who he says is his biggest support structure.
EFC fighters see the next step as being offered a UFC contract on the world stage, and Michael also weighed in on whether he is ready.
"If I want that UFC contract, I need to show more of my all-around game, and I need to accumulate more finishes.
"However, on the ground, I truly believe that I am a cut above the rest. If my opponents can't shut down the takedown, then I will keep on winning."