The club confirmed their full support for the midfielder after he revealed he went into the crowd to look for the supporter concerned after he heard the remark following his substitution on Tuesday.

West Ham, who identified the individual and removed him from the London Stadium, are continuing to conduct their own investigation into the incident.

Livermore has said as far he is concerned the matter is closed, but he was been descried as an outstanding individual by is club.

A West Brom statement said: “Following his substitution in the second half, Jake was subjected to general abuse from home supporters which he shrugged off.

“However, he acknowledges that he moved to confront one spectator who chose to make a comment about the death of his infant son.

“The club would like to think that all right-minded football supporters could understand this reaction, which did not result in any physical exchanges, before Jake was led away to our dressing room.

“Jake is an outstanding young individual who has the total support of everyone at the club and he has made it clear he considers this statement to be an end to an unhappy incident.”

Albion expressed their gratitude to West Ham for their swift response and said they were happy to leave them to deal with it.

A West Ham spokesperson said: “West Ham United can confirm that the individual involved was immediately identified and removed from London Stadium.

“After the game, West Ham United officials liaised with West Bromwich Albion, Jake Livermore himself and the Metropolitan Police to commence a full investigation into the incident.

“The player has today confirmed he does not wish to make this a police matter, however, given the nature of the allegations, the club will continue to investigate before taking the appropriate action.”

Livermore, a £10m signing from Hull 12 months ago, tested positive for cocaine in April 2015 and was subsequently suspended pending an investigation.

But in September of the same year was allowed to resume his career after a disciplinary hearing accepted he had used the drug to try to cope with the grief following the death of his new-born son.

Baggies boss Alan Pardew admitted he was concerned when he realised that something was going on in the stands.

Pardew said: “The only thing I know is I saw Jake in the crowd, which disturbed me. Obviously you don’t want to see a player in the crowd.”

The FA have requested observations from all parties and West Ham have promised to deal with matter as soon as the investigation is concluded, with a stadium ban for the individual concerned the likeliest outcome.