World Rugby is seeking clarification from Wales after a group of players from outside their World Cup squad reportedly took part in training on Wednesday.
It is understood that back-up players who do not make the final 31-man World Cup squad are not allowed to participate in training sessions with the official group.
No formal investigation has been launched by World Rugby, Press Association Sport understands, but it is aware of reports and will speak with Wales.
Even if Wales were found to have breached any tournament rules during the training session in Surrey, there is no prospect of any points deduction being imposed, with a fine or warning the most likely outcome.
There is no suggestion that Wales deliberately intended to flout World Cup regulations.