The British heavyweight suffered a surprise loss to the Chinese southpaw last month as his hopes of a world title shot were damaged but he has vowed to learn his lesson after activating a rematch clause in a bid to avenge the defeat.
Speaking to iFL TV, Joyce said: "Preparation was good sparring southpaws. I had a number of different ones. …I dunno.
"You can nitpick my performance, my participation in the camp, you can nitpick with my coaches and my team, what went wrong there.
"We had a conversation with [handlers] Adam [Morallee] and Shane [Watson] the other day about all these things and hopefully we can rectify them going forward and making improvements where needed. So, like next time around, not make the same mistakes and come in bigger and stronger and harder hopefully."
Joyce feels that credit should go to his opponent who proved that he belongs at the top level of the heavyweight division despite being in the twilight of his career.
He said: "[Zhang] showed what he’s made of and really showed that he’s a proper heavyweight that hasn’t really been given much opportunity. He’s kind of late into his career and I gave him that opportunity to my detriment and freaking got stopped, didn’t I? Obviously, I’ve gotta come back from that and come in stronger."