Sky Sports News has learned that the Football Association has begun gathering information from Gabriel and Henderson.
Following the altercation that took place during the game, the referee's report is being reviewed as well.
Oliver spoke to Henderson and Gabriel after the match, asking for their observations of the incident. This is the beginning of a possible process of discipline.
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The FA remain tight-lipped on the matter, and have repeated their original statement from Sunday night, which stated they are in discussions with all the match officials.
The governing body will have to make a decision on whether to open a full-scale investigation.
Initial inquiries are likely to take a long time. It is normal for the FA to ask witnesses who were involved in the fracas or who heard what was said.
The FA is likely to use a lip-reader as they review all of the television footage.
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The Gunners moved back to the top of the league with a victory that was secured by a late penalty.
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