The Baggies boss believes Youssouf Mulumbu should have been awarded a spot kick after being felled by Charlie Adam during the sides' 0-0 draw at the Britannia Stadium
Youssouf Mulumbu was felled inside the box when Charlie Adam appeared to clumsily clip the back of his leg, though referee Howard Webb decided to wave play on.
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"It was stonewall," he told reporters. "It is a penalty no matter what angle you look at it. He [Adam] has clearly made the foul.
"I’ll speak to the referee’s assessor as I do every week and I’m sure my thoughts will be fed back to the officials and Mike Riley and his team."
The West Brom manager, whose side are now unbeaten in five games, claimed his team were unlucky not to go home with all three points, with Amir Begovic in terrific form in the Stoke goal.
Twice he denied West Brom midfielder Stephane Sessegnon from close range, including one right at the death when it looked as though the Benin international had won the game after a fantastic run.
"We had some terrific chances. Three clear-cut in the first half. Credit to their goalkeeper who has got man of the match. On another day we should be talking about a victory but instead it’s a hard earned point."
Mark Hughes shared the view that it was a clear penalty on an afternoon where he feels a draw was a fair result for his Stoke side.
"West Brom will feel aggrieved as it did look like it was a penalty," he said. "We should have had one earlier in the season at home and I guess the decisions even themselves out.
"Overall, I feel a draw was fair. We had some opportunities early in the first half and a couple of balls flying across the goal. Stephen Ireland had a great opportunity. We are making the chances but we just have to start converting them."