The Kenyan midfielder was sent off by referee Bobby Madden ten minutes into the second half in the eventual 1-1 draw with St Mirren in Paisley for a challenge on Paul McGowan.
The decision, along with a number of others on the day, perplexed Lennon who made it clear he would appeal the sanction that comes with a straight red.
"You can presume right, yes," he said of the Wanyama appeal.
He added after McGowan's 81st minute penalty cancelled out Kris Commons' sixth minute opener: "That was the most appalling refereeing performance I have seen for a long, long time.
"I mean, you can't get so many big decisions so wrong, it is incredible.
"For me St Mirren should have had a penalty, it is a clear handball.
"You don't get many more as clean-cut as that so we dodged a bullet there.
"Then I see (Beram) Kayal getting wrestled into the advertising hoardings right in front of the linesman and he doesn't give a free-kick and two seconds later, I've got a man sent-off for nothing and the penalty that St Mirren did get was outside the box and there is no contact.
"So I am delighted that we got a point out of it but there is no doubt that the referee's decisions ruined what could have been potentially a good game.
"The sending off is ridiculous and it changed the game."