The referees union maintained on Friday that Tim Donaghy is the only ref involved in gambling activities, despite a report that he was about to rat out as many as 20 colleagues.
The report on 1050 ESPN Radio said Donaghy will turn over to prosecutors names of other NBA officials and detail their involvement in some form of gambling, believed to include betting in casinos.
The offenses may not include criminal activity, according to the report, but could violate NBA policy and lead to firings that would decimate the officiating staff. Twenty referees would make up about a third of the league's roster.