Professional Footballers Australia says it is looking into allegations A-League club Central Coast Mariners have asked players to hand in their phone records.
Club management is reportedly behind the request as the Mariners seek to find the source of a series of damaging dressing room leaks - including tactical information which has found its way to opposition teams on game day.
"Professional Footballers Australia have been made aware of a request made by the Central Coast Mariners," a PFA spokesperson said.
"The PFA's lawyers are currently working with the club to understand the nature of their request."
It is the latest controversy to hit the struggling Mariners, who recently severed ties with experienced defender Eddy Bosnar and are still trying to agree to terms on a release for banished goalkeeper Liam Reddy.
The club is yet to respond to requests for comment.
Central Coast are currently eighth on the A-League ladder with just one win in six rounds and face champions Melbourne Victory on Thursday night.