Leeds have opened an official investigation into the incident involving Anthony Elanga and home supporters on Sunday.
The Manchester United forward was pelted with unidentified objects by Leeds fans in the second half of the game at Elland Road.
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Any Leeds supporter found guilty of throwing things at Elanga on Sunday — or anywhere on the pitch — will be hit with a lifetime stadium ban.
The English Football Association are investigating the incident as well. The Man United youngster required minor treatment on the pitch, drawing FA’s attention.