Fulham have vowed to take the "strongest possible action" after Aboubakar Kamara was racially abused on social media following his penalty miss on Saturday.
The forward was criticised for refusing to allow the club's designated penalty-taker Aleksandar Mitrovic to take a spot-kick during Saturday's 1-0 victory over Huddersfield while the score was still goalless, and then missing it.
Mitrovic scored in stoppage time to secure a crucial victory but Kamara was then abused on social media and Fulham have promised to act.
"We are aware that numerous damaging and hurtful comments have been posted on Aboubakar Kamara's social media account, and as a club that prides itself on our respect and civility, we condemn anyone who may be associated with this repulsive activity," a club spokesman said in a statement.
"This is not representative in the least of genuine Fulham supporters, many of whom have posted messages of support and encouragement to the player.
"The club will provide all necessary support to Aboubakar and will take the strongest possible action against those identified and responsible for these posts."
Speaking post-match, Fulham's manager Claudio Ranieri had accused the 23-year-old Kamara of disrespecting the club, his team-mates and their supporters through "thinking of himself".
Mitrovic instead insisted he understood why Kamara had acted as he did, saying: "He's a striker, he's hungry for goals as well, maybe he wanted to score as well and he scored his last penalty.
"It's normal. He's young; these kind of things can happen. It's normal.
"You need to take care of each other."