Gary Rowett will be disappointed with the way the season ended for Millwall.
The Lions won only one of their last six league games, and lost 6-1 to Coventry City on the final day of the season.
They will look to start the season strongly in 2021/22, and go one further in their pursuit of a play-off finish.
Can you name the Millwall player who has been carded the most in each of the last 16 seasons?
Have a go at our quiz…