The Slovenian boss was sacked by owner Massimo Cellino almost immediately after Wolves came from 1-0 to take all three points in Milanic's sixth game in charge.
He said: "We were a bit naive as a team and I think that is where we struggled a bit with the language barrier.
"Everyone's shouting different things in different languages and it can get a bit muddled. It's difficult to get information to each other.
"It's really disappointing because what we were doing first half was working but for some reason we decided to change and start thinking we could play like Barcelona.
"When you have someone on the floor you need to keep stamping on top of them - we stopped doing that."
Morison also thinks new manager Neil Redfearn should have been given the job last time around.
He said: "We'd won three games out of four and everyone just wanted to carry things on but then all of a sudden it was changed.
"Under Neil Redfearn we all worked really hard in training and under this manager it was a lot more tactical. It was a shock for the British lads. I didn't think things were as good as they had been."
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