Boss Mark Hughes accused Claudio Yacob of getting Geoff Cameron sent off after Stoke slipped to a 2-1 defeat at West Brom.
Jonny Evans' injury-time winner capped late drama after Cameron was dismissed minutes after Jonathan Walters had levelled for Stoke.
United States international Cameron walked with nine minutes left after he pushed Yacob in the back of the neck following the Argentinian's challenge.
But Hughes felt the Baggies midfielder over-reacted to ensure the Potters were left with 10 men at The Hawthorns and will consider appealing.
He said: "We weren't too happy with the reaction of the lad Yacob to be perfectly honest. I thought he has gone down with the intention of maybe getting Geoff sent off and unfortunately for us that's what he's able to do.
"We'll have a look at it on Sunday and make a decision on whether or not we appeal. My initial thought is we probably will appeal.
"It was unfortunate. I thought Geoff has reacted to a late challenge on a leg he injured in the first half. It is understandable to a certain extent."
And Hughes felt the late red played a huge part in Evans' injury-time winner.
He added: "At set-plays you are one man down and they are throwing everyone forward. At some point there is someone free.
"We could have done better to clear the chance, it's bobbled across and ended up in the far post for the tap-in.
"We certainly didn't play anywhere near like we're capable of."
It had been a dull game before Stephane Sessegnon's first goal since October 2014 opened the scoring and set Albion up for successive wins.
It was Tony Pulis' third straight victory over his former club and the Baggies are now nine points clear of the Premier League relegation zone.
Pulis said: "Irrespective of whether it's against Stoke or anyone the most important thing is three points and back-to-back victories. It's a busy period and we have gone into the game without four players.
"To put in a performance we have done without four major players is fantastic.
"Luckily for us it drops to Jonny at the end. He has been a great signing for us. He's not just a good defender but his quality on the ball is first class. He just oozes class."
Sessegnon looked to be out of Pulis' plans this season but he has fought his way back into the side. It was just his seventh goal in two-and-a-half years at Albion and Pulis wants the 31-year-old to score more.
"I pulled him [aside] this week. I thought he was fantastic against Newcastle and told him he needed goals," he added.