Martin Allen was frustrated with John Akinde's second yellow card in Barnet's 1-0 defeat at Wrexham.
Robbie Evans scored the only goal of the game before the Conference's top scorer received a second yellow card for diving.
Allen did not want to incur the wrath of the FA for criticising a decision but felt that referee Ian Hussin made a mistake.
Allen said: “John has said that he got tripped. We’ve seen that numerous times. I thought he had got tripped and the Wrexham subs thought that he had got tripped. But the referee didn’t see it that way so we have to accept and respect his decision and deal with it.
“It did make it difficult. But Michael Gash has been outstanding in training, he has been knocking the goals in and has shown a great attitude so he is already pushing for a starting place so I suppose now with John suspended then Gash is going to play.”
Allen was also frustrated after his side missed chances as the Bees were unable to tame the Red Dragons.
He added: “I thought that they played very well during the first half – they were better than us. In the second half I thought that we were very unlucky. We had numerous chances and opportunities but they just didn’t go in today, when through the year they have gone in.
“But the Wrexham boys fought for their club and put their bodies on the line, like they did at our ground when they beat us earlier in the season.
“They rode their luck and there were a couple of decisions that went against us today which I thought were questionable but if the chances don’t go in then you don’t win the game.
“It was a brilliant save for Luisma’s free kick. The last ten minutes of the first half as well we had another couple of good chances but they didn’t go in. Today I’ve got to say that I thought that they gave everything that they’ve got but it just wasn’t enough.
“The one thing that you can’t ever question with our players is their attitude but we did need to tweak it to improve in certain areas of the pitch and I think that we certainly did that in the second half.”
