Millwall Football Club is a professional football club based in London, England. The team was founded in 1885 and currently plays in the Championship, which is the second tier of English football.... Recently, Millwall has worn predominantly navy kits, with white accents, white shorts and blue socks. The club's home ground is The Den, which has a capacity of just over 20,000 spectators. Millwall has a strong fan base and is known for its passionate and vocal supporters.