Wolves boss Gary O'Neil was angered by the penalty they conceded in their 2-2 draw with Newcastle.
Callumn Wison converted before halftime to send Newcastle 2-1 ahead.
O'Neil later said: "There wasn't a penalty in the first half. No way is that a penalty. I don't know how they have got that so wrong. There is no contact on Schar and he is already on the way down.
"The ball hits Channy (Hwang) on his other foot before it makes contact with Schar. Technically, he gets the ball first. A terrible on-field decision and really surprising it wasn't overturned. I waste my time talking to them so I won't bother until they improve the level.
"" I was frustrated and we speak a lot about being ready for the next action. There are things that will set you back. We need to refocus and they were excellent at that today - the best I have seen us at it."