Few rivalries in English football carry the venom of West Ham United against Millwall. Fuelled by geography, social history and decades of hostility on the terraces, the fixture has long been one of the most feared in the capital. For much of the modern era the two sides have rarely met, with West Ham establishing themselves in the Premier League while Millwall toiled in the lower reaches of the Football League. That changes in the 2026/27 season, when both clubs find themselves back in the Championship, setting up a reunion at The Den that will carry far more weight than the standard three points.
Despite the bitterness between the two fanbases, a number of players have quietly moved between the clubs over the years, seemingly unbothered by the supposed unwritten rule against turning out for both sides.
One of the more curious cases is Clive Allen, a proven goalscorer throughout his career, who joined West Ham in 1992 and scored 17 goals in 38 league games before a switch to Millwall for the 1994/95 campaign. His time at The Den proved far less fruitful, with just 12 appearances and no goals to show for it.
Neil Ruddock's association with the divide runs deeper than most. The defender, best remembered for his combative spell at Liverpool, actually started out at Millwall, having been with the club since he was 13 before making his senior debut there in 1988. Years later, after leaving Liverpool, he joined West Ham and went on to make 42 league appearances for the Hammers between 1998 and 2000.
Glen Johnson's journey took him in the opposite direction. The attacking full-back began his career at West Ham in 2002 before being loaned out to Millwall, where he featured eight times. Johnson would go on to greater things, moving to Chelsea and later Liverpool, where major honours followed, including Premier League and League Cup success.
Perhaps the most distinguished name to have represented both clubs is Teddy Sheringham. He spent eight years developing at Millwall, netting 93 goals before moving on to Tottenham and then Manchester United, where he became a Premier League and Champions League winner. Sheringham's overall tally for Millwall and Spurs combined topped 125 goals before he returned to east London for a three-year stint with West Ham from 2004, remarkably still finding the net in the Premier League past his 40th birthday.
Tony Cottee's path mirrors Sheringham's in reverse. A West Ham academy product, Cottee scored 92 league goals for the Hammers between 1982 and 1988 before returning to the club in 1994. Better known for prolific spells at Leicester City and Everton, where he scored close to 100 league goals combined, Cottee's career came full circle with a brief and low-key finish at Millwall, making just two appearances in 2001.
As West Ham and Millwall prepare to renew their rivalry in the Championship, the history of players who have worn both shirts serves as a reminder that, despite the animosity between supporters, football careers often follow their own logic. When the two sides meet at The Den, memories of Allen, Ruddock, Johnson, Sheringham and Cottee will be a footnote to what promises to be one of the most fiercely contested fixtures of the season.
Based on reporting from Standard Sport.