Athletics' world governing body could impose sanctions on relay team-mates of disgraced US sprinter Marion Jones.
Jones retired soon after the IAAF imposed a two-year automatic ban
Jones, 31, admitted to taking steroids and has returned the five medals she won at the Sydney Olympics in 2000.
But IAAF general secretary Pierre Weiss said members of the 4x100m and 4x400m relay teams could also be penalised.
"Regarding her suspension, regarding her money, regarding medals, what will happen to the relays? Those are good questions," he said.
"We are investigating the case, we have asked the member federation in the USA to make a report."
Jones was given an automatic two-year ban after confessing she had taken tetrahydrogestrinone (THG) from September 2000 through to July 2001.
The 31-year-old, who faces a six-month prison sentence for lying to US federal investigators, could also face legal action from meeting promoters who paid her large sums in appearance and prize money.
"We haven't seen the report yet - it will be much too complex," added Weiss.