Manchester United: 5 downgrades.

1892-93 season, League One was promoted and lowered for the first time. Newton Heath, the predecessor of Manchester United, came last, but beat Birmingham to avoid relegation in the play-offs. 1 After the season, they came to the bottom again, losing 2-0 to Serie B champion Liverpool in the play-offs, and were relegated for the first time. 1905-06 changed its name to Manchester United, and was promoted to the second place in the British Championship.

192 1-22 season, Manchester United was relegated to the bottom of the league, and after three seasons, it was upgraded to the runner-up of the second division again. 1930-3 1 season, Manchester United started with a losing streak of 12 and came to the bottom again. 1933-34 season penultimate round, Manchester United ranked second in the penultimate round of the second division, setting a record for the lowest ranking in history, but in the last round 1, Manchester United won a thrilling relegation. 1935-36 season, Manchester United remained unbeaten in the last round 19, won the second-division championship and returned to the first-division league, but was relegated again after 1, and was upgraded in the 1937-38 season. Thirty-six years later, in the season of 1973-74, Manchester United was relegated again, and in the season of 74-75, it won the promotion of the second-division championship. Since then, he has been playing in the top leagues in England.

Arsenal: 1 relegation.

19 12- 13 season, financially troubled arsenal won only three games, and the team's top scorer scored only four goals, ranking last 1. 19 19-20 season, League One expanded to 22 teams, and Arsenal was selected into the first division, and has not been relegated since then.

AC Milan: Two demotions.

1979-80 season, defending champions AC Milan and Lazio teamed up to match the ball and fell into the "Tottenero gambling scandal". The two teams were awarded the bottom two and relegated. After 1 season, AC Milan won the second-division championship, but due to the serious loss of the main force, AC Milan retreated to the bottom three in 198 1-82 season, and won the second-division championship again after 1 year. At the end of the 2005-06 season, Calciopoli broke out, and Milan almost relegated, but in the end it was only a penalty, which saved Serie A qualification and won the Champions League in 2006-07 season.