Aston Villa are set to appeal against the controversial red card shown to Chris Herd in Saturday's 2-1 defeat by West Brom.
The versatile Herd was sent off following a seemingly innocuos tangle with West Brom defender Jonas Olsson which led to the visitors also being awarded a penalty.
Referee Phil Dowd dismissed Herd after his attention was drawn to the incident by his assistant and McLeish feels guesswork was involved.
Villa had been leading 1-0 at the time of the red card and McLeish is adamant that Herd did nothing wrong.
"No doubt about it, looking at the pictures again Chris (Herd) has done nothing wrong," McLeish told Sky Sports News.
"It's a poor decision on the day by the official.
"These things are not deliberate - he's made an honest mistake. It's a shame that he's guessed the decision, rather than seeing anything."
The derby fixture also saw Alan Hutton escape punishment for a challenge that saw West Brom striker Shane Long sustain potential ligament damage.
McLeish moved to stress the unfortunate nature of Hutton's foul, wishing a speedy recovery for the West Brom forward.
The Villa boss added: "It always gets highlighted when a player gets injured but there's going to be collisions. Hutton wasn't the favourite to get the ball, Shane was upright but he slid for the ball - threw his body at it.
"You'd want to see your players make the challenge in the box to prevent a goal.
"But unfortunately, the momentum of the collision that took place left Shane injured, hopefully it's not too bad. We hope that he recovers quickly."