The UFC fighter was beaten by Poirier in the Octagon earlier this year and Kavanagh suggested that his man was distracted by a potential clash in the ring with legendary boxer Manny Pacquiao.
He told BT Sport: "I describe it as a game of spinning plates. You’re spinning the boxing plate and you realize the wrestling plate is about to stop, so you have to go spin that one, and then you have to go spin the jiu-jitsu one, you have to spin the kickboxing one.
"We got a bit obsessed with the boxing one. There was talk of a big boxing fight after that. Our bad, our mistake, our fault – no one to blame. We just have to make sure we have to keep spinning that kickboxing plate and all the other aspects of MMA and get ready for the rematch."
McGregor's future plans remain unclear but Kavanagh suspects that it will only take a few tweaks to make him a feared force in UFC once again.
He explained: “We have to fix that technical detail. It’s not like we have to fix everything.
"It’s just a small enough area, get that back into the whole game. The knock on him was the boxing mentality going into an MMA mentality. Conor was always famous for his movement, his ability to change stances, his bounce as he would say, and we need to bring that all back. It’s there; it’s under the hood. It’s not like the skills need to be learned or even relearned. They just have to be reignited and we have to start that process."