The Football Association of Wales (FAW) have confirmed they are investigating Swansea City and their players after their abuse of rivals Cardiff City.
The Police have already confirmed that they are investigating the matter which occurred after the Football League Trophy Final - where Swansea beat Carlisle United.
The incident saw a flag adorned with an expletive aimed at Cardiff paraded by Alan Tate, Roberto Martinez and Lee Trundle - and the latter also donned a T-Shirt with an apparent offensive message on it, again aimed at The Bluebirds.
The FAW stated they too would be looking into the matter.
"The images paraded by Swansea City players were of an extremely offensive and insulting nature and such behaviour is totally unacceptable," said an FAW statement.
"Currently, the Football Association of Wales is collating evidence in relation to these events which may result in charges of misconduct being preferred against certain individuals and the club."
South Wales Police's chief superintendent Bob Evans reaffirmed what action they would be taking.
"We've had a number of complaints - many from Swansea fans it must be said - and are therefore obliged to launch a full investigation into the matter," he said.
"We take a very dim of this matter because there were a lot of families and young children at the game and it is noticeable that many Swansea fans have themselves come to us to make a complaint - it has not been only Cardiff fans.
"It's therefore highly likely that we'll be speaking to a number of players as soon as possible in relation to this matter, and also evidence such as CCTV will be closely examined.
"I want this matter cleared up as quickly as possible because Swansea could be playing in Cardiff again in a few weeks' time, if they get to the League One play-off final."
Trundle and Tate will be interviewed by Police this week, it is not yet known whether anyone else will be questioned.