French online gaming authority ARJEL is to investigate after Lyon qualified for the knockout rounds of the Champions League in incredible circumstances.
ARJEL has now said it is "carrying out checks" on the match in Zagreb amid suggestions of foul play.
Ajax also saw two goals controversially disallowed for offside at the Amsterdam Arena and coach Frank de Boer had said after his side's exit that he felt an investigation may be appropriate.
"If there was something unusual, UEFA should investigate what happened in Zagreb," De Boer said. "My assistants have told me that the goals came quick and easy, because you can't normally score these goals in half an hour.
"Destiny was in our own hands and we had chances to qualify because our game was very even. I will have to see video replays (of the disallowed goals)."
Lyon have released a statement today saying they understood the checks by the regulatory authority for online games (ARJEL) were necessary in the case of such an "atypical" result.
The statement on their official website read: "Lyon have become aware of the checks being carried out this morning by ARJEL, which fit with the procedures of the agency responsible for the regulation of online gaming.
"The club agree totally that action should be taken when a result is considered atypical."