Luiz Adriano alleges racism
Shakhtar Donetsk were thumping 7-0 winners at BATE in UEFA Champions League Group H action.
Luiz Adriano scored five of those goals - matching the feat set by Barcelona's Lionel Messi in 2012 - but the achievement has been soured by the Brazilian's allegations of racism at Borisov Arena.
"I heard rude abuse … racist ones [chants]," the striker was quoted as saying on Shakhtar's official website.
"Supporters behaved improperly and that is why I am disappointed and feel resentment. It was an ugly act from their side."
Luiz Adriano also scored the fastest four-goal haul - 17 minutes - in Champions League history, surpassing the previous 24-minute record set by Dado Prso 11 years ago.