McKenna was furious at the first of two yellow cards ref Rob Jones gave defender Axel Tuanzebe in Saturday’s 1-1 draw at Aston Villa.
Even if it was a foul, I think it was a decision given against a smaller team against a bigger team away from home.
"Even if it was a foul, so many times this season I've not seen a yellow on the first foul at all.
And of Tuanzebe's initial booking he added: "Anyone can make a mistake but I think it's more how quickly the yellow came out.
McKenna said: "A really good solid first 40 minutes, pretty much even stevens, then down to 10 men.".
