CONCACAF and CONMEBOL presidents Alfredo Hawit and Juan Angel Napou were arrested Thursday, while 16 more individuals were charged.
FIFPro says FIFA should be "very shamed" as the world players' union demands change after more officials were engulfed in the corruption scandal.
It was another dark day for football on Thursday following the arrests in Zurich of CONCACAF and CONMEBOL presidents Alfredo Hawit and Juan Angel Napou on the suspicion of accepting bribes worth millions of dollars.
United States officials also charged 16 more individuals, including Brazilian Football Federation president Marco Polo del Nero, as part of an investigation into corruption within world football's governing body.