Derby boss, Wayne Rooney, said it was “disappointing and upsetting” to hear some Millwall fans boo players taking a knee at the start of Saturday’s Championship match.
The Den was able to host 2,000 fans for the first time this season after the second national lockdown was lifted.
However, the return of spectators was overshadowed by the pre-match incident.
“To hear that is very disappointing and upsetting for a lot of people,” said Rooney, whose side won the game 1-0.
“I’m pleased with how my team dealt with that. They’ve had to put that to the back of their minds for the 90 minutes but I’m sure it’s something they were thinking about.”
The Football Association and anti-discrimination body Kick It Out have condemned the booing, while Derby forward Colin Kazim-Richards described the incident as “an absolute disgrace”.
Players, officials and staff at Premier League and English Football League games have been taking a knee pre-match since football restarted in June in order to show their support for the Black Lives Matter movement for racial equality.