According to Mr Collins, the player”s tweet read: “What I won”t accept is an opinion from a man who”s crooked and ruining the game – Neil Warnock, the man who signs players, gives them extra wages n app bonus to make sure they pay him to get in the team or on the bench.
“The fact he could even talk about training is shocking, he was never there.”
Puncheon also played under Warnock, 67, during a loan spell at Queens Park Rangers.
The 30-year-old”s tweets accusing Warnock, who took over at Cardiff City last week, were later deleted.
He was fined £15,000 by the FA for failing to act in the best interests of the game.
Mr Collins asked why there was not a further internal investigation into Puncheon”s tweet.
FA chairman Greg Clarke failed to answer why but FA director of strategy Robert Sullivan replied: “That is absolutely correct.
“Where the line is difficult to draw is bringing forward real evidence which can be used to take an investigation forward.
“There is evidence on social media and there is hard evidence.”
Warnock later insisted he and Puncheon had “put their spat to bed” in 2014.
Warnock has managed 17 different clubs at Premier League and below across 36 years in management.
Daily Star Online has contacted Cardiff City for comment.