MILLWALL manager Harris was unhappy with key decisions he felt went against his side in the 1-0 defeat to Brentford on Saturday afternoon.
The Lions were denied a goal when referee Lee Probert whistled for a penalty for a foul on Jed Wallace moments before Lee Gregory stroked the ball home with 10 minutes left.
Gregory then saw his spot-kick saved by Bees goalkeeper Dan Bentley.
Harris felt two other penalty decisions went against his side.
"I'm disappointed with some key decisions but I saved most of my frustration for my players," Harris said.
"You guys [the media] might not be so aware at the time but there was a clear punch on the ball in the first decision.
"After 55 minutes we took a corner, their centre-half steps out and punches the ball clear, a lot of people didn't see it – it's clear as day on the video.
"The second one is the [Shaun] Hutchinson decision. He toes the ball past the lad, he's stepped on his foot. It was an unfortunate event, but it was a penalty. And, unfortunately for us, that moment probably kills the next one.
"The referee knows he got it wrong that he so quickly gives the next incident before it breaks to Gregory."
Harris added: "Lee has been good enough to come and see me, he's a smashing fella, and a really top referee as well.
"He's said to me that if it's a penalty he has to give it really quickly. I disagree.
"I think he can buy himself a split-second to see where the ball falls.
"He didn't, and probably gives it as he didn't give the one before.
"If there is a rule that you have to give a penalty quickly and you can't play advantage in the penalty area, it's certainly a rule I am not aware of. I will have to check my rule book for that.
"However, if Lee Gregory scores from the penalty spot, we aren't having this conversation."
Image: Millwall FC