In his post-match interview after the 2-1 defeat to West Ham last night, West Brom manager Alan Pardew described the incident involving Jake Livermore as 'disturbing'.
Cameras caught Livermore appearing to climb into the crowd to confront a West Ham supporter.
The England international had to be pulled away and was eventually escorted down the tunnel by West Brom coach John Carver.
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Credit: WEARNOWHU
It all happened when the 28-year-old was replaced by Hal Robson-Kanu in the second half. Rumours have emerged that a Hammers fan shouted something at him.
Pardew admitted that he saw Livermore in the crowd, but did not know what prompted his actions.
"The only thing I know is I see Jake in the crowd, which disturbed me. Obviously you don't want to see a player in the crowd." Pardew said
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"There's no way he's going in the crowd - because I know him, he's a great lad - unless he was provoked severely. That's all I know.
"I haven't had a chance to talk to Jake. I'll speak to Jake and we'll go from there."
Eye witnesses reportedly saw Livermore taking a swing at a supporter during the incident, with some suggestions the reasons behind what happened in the second-half.
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West Ham manager David Moyes also commented, saying that he didn't see it happen but has been 'told something':
"I didn't know about it, but I've been told something happened." he said via Sky Sports.
Both clubs are now working together to grasp what really happened.