The 2-15 edition of the Bangladesh Premier League has as many as 180 foreign players in its roster at the moment.
Aamir, Butt and Asif all completed their five-year bans for spot fixing last month.
Returning paceman Mohammad Aamer took seven wickets in an innings of a domestic match in Multan on Friday.
Flanagan said that he had completed his responsibility by providing justice to the disgraced trio.
Rameez Raja also spoke out against the "special treatment" that Butt, Asif, and Aamer got at NCA.
PCB has announced a reintegration and rehabilitation program for the trio, which rules them out of first-class cricket until February 2016.
Aamer speaks candidly about how he coped being away from a game that he loves, his hopes to attain the status of Pakistan's top bowler again.
Aamer insisted that he needs to make sure that he was mentally and physically ready for international cricket.
Mohammad Aamer was banned from international cricket in 2010.
As he makes his way back to domestic cricket, Mohammad Aamer has made an impact.