Police are preparing for a high-security weekend in the Championship as two fierce rivalries return, with Millwall hosting West Ham and Wolves facing West Brom.
Championship leaders West Ham travel to the Den on Saturday for the first "Dockers Derby" against London rivals Millwall in 14 years.
A day later, Wolves host fourth-placed West Brom in the Black Country derby, two years after their previous meeting was overshadowed by serious crowd disorder.
Few rivalries in English football carry the history of Millwall against West Ham.
The hostility between the clubs stretches back more than a century to their roots in London's docks and has been accompanied by several serious incidents over the years.
One supporter from each club was killed in clashes in 1976 and 1986, during an era when hooliganism was a major problem across English football.
More recently, a Millwall supporter was stabbed outside West Ham's former Upton Park home before a League Cup meeting in 2009.
That match was also marred by several pitch invasions, with then sports minister Gerry Sutcliffe describing the scenes as "a disgrace to football".
West Ham were subsequently fined £115,000 for failing to prevent supporters from entering the pitch, while several fans were convicted of violent disorder.
Separated by just eight miles across the River Thames, Millwall and West Ham will meet for the 100th time on Saturday amid an increased police presence across south-east London.
Threats have also circulated between rival supporters on social media ahead of the fixture.
"We want fans to enjoy the match safely and have worked with both clubs to help this happen," the Metropolitan Police said.
"A Section 35 dispersal order will be in place, allowing officers to remove anyone causing disorder."
Around 19,000 supporters are expected for a sell-out crowd at the Den, including 1,774 West Ham fans.
Some Millwall supporters will be located in the same stand as the travelling West Ham contingent, although strict segregation measures will be used to keep the rival groups apart.
Millwall have not beaten West Ham since 2004, and Lions manager Alex Neil hopes the atmosphere at the Den can give his side an advantage against Nuno Espirito Santo's Championship leaders.
"It should be a brilliant atmosphere. It means a lot to our fans and everybody connected with both clubs," Neil said.
"It'll be interesting to see how West Ham handle the Den and different things like that."
Just 24 hours later, attention will turn to the West Midlands as Wolves and West Brom meet in the league for the first time in five years.
Their most recent encounter came in the FA Cup in 2024, when Wolves' 2-0 victory at The Hawthorns was overshadowed by serious crowd trouble.
The match was suspended for 38 minutes after clashes erupted in the stands. Police officers were assaulted, missiles were thrown and flares were set off.
A total of 43 arrests were made, with 12 people later sentenced and five receiving permanent bans.
Ahead of Sunday's derby, Wolves and West Brom issued a joint statement confirming supporters can expect "enhanced stewarding, policing, robust ticketing controls and additional safety measures".
The clubs also stressed that the punishments handed out following the 2024 disorder demonstrated that "disorder, violence and criminal behaviour carry significant consequences and will continue to be dealt with robustly".
With two historic rivalries returning on the same weekend, all four clubs and the authorities will be hoping the focus remains firmly on the football.
