Ex-Ireland internationals Stephen Hunt and Gary Breen have voiced their concerns about Kenny, who has graduated from being Under-21s boss to take over the senior job from Mick McCarthy.
But McClean told The Derry Journal: “I have seen a few comments from a few players, for example Gary Breen. I think Gary has spent too much time in England.
“I’m pretty sure Gary doesn’t know much about the League of Ireland. The fact he said Stephen (Kenny) has failed everywhere other than Dundalk proves that point.
“Gary doesn’t know the League of Ireland. If he did, he would know Stephen (Kenny) fully deserves this job and he hasn’t been a failure anywhere else.
“I have also seen people like Stephen Hunt saying senior players are going to be worried and this and that, but Stephen Hunt’s international career didn’t really pull up many trees.
“Stephen is probably best known for his clash with Petr Cech, so for him to give his opinion on Stephen is a joke.”