Chris Wilder, the Sheffield United manager, criticised referee David Webb for his late decision as his Blades side were held at home by Millwall after a 95th-minute equaliser.
Wilder was left fuming after Webb didn't penalise former Blade Ryan Leonard for a trip on David McGoldrick, moments before Jake Cooper headed home a late equaliser to cancel out Gary Madine's earlier opener and break Blades hearts.
Millwall also missed a penalty, Ben Marshall hitting the crossbar after John Egan handled on the line and was sent off, while both Billy Sharp and Chris Basham limped off with hamstring injuries.
And Wilder said: "To get that decision wrong, right in front of him, is astonishing.
"I trust my eyes and I've seen it back on film, too.
"Did we deserve three points? No, and I'm not blaming the performance of the team on the ref.
"But to miss a situation like that, right in front of him... there's quite a bit to play for at this level and the stakes are quite high."
Wilder ran onto the pitch to confront Webb at the final whistle, and revealed afterwards what he said to the referee.
"I told him he'd got it completely wrong," Wilder added.
"It's a decision that's cost us. Everyone in the ground jumped on it; seven of our players have their hands in the air after it.
"I've looked at it twice, as I say, and I'd be staggered if I've got it wrong. It's just a terrible decision in a big moment."