"The penalty was never a penalty. In big games you've got to be 100% certain and I don't know how he could have given that," said Rush.
"It's easy to look back with hindsight - but it didn't even look a 'nearly' penalty at the time, so it's very disappointing.
"But just as bad as that decision was the number of yellow cards he dished out. It was not a dirty game, but he still handed out nine yellow cards - and there wasn't one bad tackle in the game.
"Rob Styles is getting a reputation for acting without thinking and on this occasion he's let Chelsea off the hook. But it's not the first time he's done it and these are major decisions which he's getting wrong."