The League One strugglers are not in a good position, as they have furloughed several of their players during this crisis.
That prompted a harsh response from the PFA, and they are still 16 points off safety in League One.
There was reportedly also a row between players and the club, as the players were asked to take a 50 percent pay cut!
Now The Sun reports that Campbell has had enough and is ready to move on.
The club's owner Ron Martin already furloughed six of his most well paid players, and 59 backroom staff members.
In a statement, the PFA said: "We're extremely disappointed with the statement made by Ron Martin, which represents an unfair portrayal of the players and an inaccurate reflection of the club's situation.
"Throughout this season, the club has consistently let its players down with regards to late or non-payments of salaries. Despite the distress this caused, players responded in a professional manner, continued to train and felt a duty to complete fixtures."
Speaking to talkSPORT yesterday, Martin responded: "I'm surprised the PFA have come out and said that.
"Everybody else at the club accepted the situation, with the exception of six players.
"Everybody else has been paid in full, and those six were paid in full up to the furloughing start date.
"After that they were paid the remaining proportion of their wages."