Leeds United has passed CCTV footage of fans who allegedly threw objects onto the pitch in Sunday's match with Manchester United to the police.
Visiting player Anthony Elanga was hit by something thrown from the stands at Elland Road while celebrating United's third goal in their 4-2 win.
The Yorkshire club says any supporter who's found guilty will be banned from the stadium for life.
A statement from them on Tuesday evening in relation to the incident said:
"Following CCTV checks conducted yesterday, we can confirm that a small number of supporters who threw objects onto the pitch at Sunday's match have already been identified.
"As this is a criminal offence, the images and footage have now been handed over to West Yorkshire Police who will seek to arrest the individuals, using the information provided by the club.
"Not only do these people face criminal prosecution, but they will also be banned from attending Leeds United games pending the outcome of the police investigation, they will then be subjected to lifetime bans if found guilty.
"These people do not represent our loyal fanbase, but there is no hiding from the fact that this is not the first incident of this kind experienced at Elland Road this year. We want to be clear that this is not acceptable behaviour and will not be tolerated."