Newcastle boss Alan Pardew said Friday's defeat to Manchester United could have turned out differently had the Magpies been awarded in the first half.
Juan Mata appeared to clip Yoan Gouffran's heels, but referee Michael Jones refused to award the away side a spot-kick.
"The referee has got a bad call very wrong," the Newcastle manager said.
"I think that was a penalty. I think Mata's run across the back of a player who is going to head the ball across goal. That's a goal scoring opportunity....