Authorities have identified the body inside the plane wreckage found in the English Channel as that of Argentinian footballer Emiliano Sala.
However, video later emerged on social media of two men in the home section of the stadium apparently making aeroplane gestures in the direction of the away fans.
An extensive rescue and recovery operation followed the incident.
Sala's picture was also shown on the Craven Cottage big screen alongside that of the Cardiff badge.
Investigators recovered the body on Wednesday and transported it to the Isle of Portland in southern England.
Sala's family said that it was with "infinite sadness" that they had identified his body.
"When something like this happens it brings all the football family together", he said.
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Argentine newspaper Clarin last month published a voice message that Sala apparently sent to friends while in the air.
The footballer's body was recovered from the plane wreck on the seabed, but Mr Ibbotson's body has not been found.
'Such behaviour has no place in our game and will not be tolerated at St Mary's.
Southampton said they would work with Hampshire police to identify individuals who made indecent gestures towards Cardiff supporters.
However, the striker's initial disappearance and subsequent death did not dampen Cardiff in their pursuit to get out of relegation zone as they battled Southampton to a 2-1 victory at St. Mary's.
"Emiliano Sala arrived on the backs of the Edre in July 2015 and knew how to win the hearts of the Nantes supporters".
"We offer our most heartfelt sympathies and condolences to the family of Emiliano", Cardiff City said in a statement on Thursday.