The Irish Football Association are waiting to hear from UEFA before deciding whether to conduct their own inquiry into an alleged incident at the end of the European Under-21 Championship match last night.
There were chaotic scenes in the tunnel at Ballymena after Northern Ireland had drawn 1-1 against Ukraine.
Players from both sides jostled and argued following a highly competitive match.
The Ukrainians decided to lodge an official protest with UEFA, claiming one of the Northern Irish players assaulted midfielder Andriy Berezovchuk.
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The IFA say they are unaware of any incident but spokesman John Quinn added: "We have been informed a complaint has been made.
"We are waiting to hear from UEFA before deciding what to do next, if anything."