Millwall's Jake Cooper, centre, greets Crystal Palace's Romain Esse after the English FA Cup soccer match between Crystal Palace and Millwall at Selhurst Park, London, England.

Crystal Palace supporters hold up banners antagonising their opponents during the English FA Cup soccer match between Crystal Palace and Millwall at Selhurst Park, London, England.

Crystal Palace's Eddie Nketiah scores his side's third goal during the English FA Cup soccer match between Crystal Palace and Millwall at Selhurst Park, London, England.

Crystal Palace supporters hold up banners antagonising their opponents during the English FA Cup soccer match between Crystal Palace and Millwall at Selhurst Park, London, England.

Millwall's goalkeeper Lukas Jensen dives but fails to save the goal from Crystal Palace's Eddie Nketiah during the English FA Cup soccer match between Crystal Palace and Millwall at Selhurst Park, London, England.

Millwall's goalkeeper Lukas Jensen dives but fails to save the goal from Crystal Palace's Eddie Nketiah during the English FA Cup soccer match between Crystal Palace and Millwall at Selhurst Park, London, England.

Crystal Palace's Romain Esse, centre, kicks the ball during the English FA Cup soccer match between Crystal Palace and Millwall at Selhurst Park, London, England.

Millwall's Joe Bryan, right, challenges for the ball with Crystal Palace's Romain Esse during the English FA Cup soccer match between Crystal Palace and Millwall at Selhurst Park, London, England.

Millwall's Japhet Tanganga kicks the ball during the English FA Cup soccer match between Crystal Palace and Millwall at Selhurst Park, London, England.

Millwall's Wes Harding celebrates after scoring his side's opening goal during the English FA Cup soccer match between Crystal Palace and Millwall at Selhurst Park, London, England.