Batshuayi played the entire 90 minutes as substitute Marcel Schmelzer's 82nd-minute equaliser sent Dortmund into the round of 16 with a 4-3 aggregate victory.
The Belgian striker moved to the German club on loan on deadline day from Chelsea.
During the course of the game, Batshuayi claims to have been subject to racist chanting by the Italian fans. Batshuayi took to Twitter and slammed those participating in the chants from the stands saying that he couldn't believe these things still happen in 2018.
The Belgium worldwide, on loan from Chelsea, wrote on Twitter that fans at Reggio Emilia's Mapei Stadium made monkey noises during the 1-1 draw. "I'll be honest, I didn't hear them", he said.
He scored five goals in his first three appearances for Peter Stoger's side, including a crucial injury-time victor to make it 3-2 against Atalanta in the first leg of the last-32 tie last Thursday. "This should never happen", Percassi told Sky Italia, as quoted by Football Italia.
And the 24-year-old hit the ground running after netting five goals in five appearances.