whufc.com selects a five-a-side team from players who have represented both West Ham United and Sunday's visitors Liverpool...
With 53 England caps to his name, Herftordshire-born stopper David James was one of the Premier League's leading glovesmen across the 1990s and 2000s.
He turned out for Liverpool for most of the former decade, playing 214 Premier League games between the sticks for the Reds and winning the League Cup in 1995.
He moved on to Aston Villa in 1999, rocking up at the Boleyn Ground two years later. The 6'4 keeper would spend three-and-a-half years in east London, making over 100 appearances.
Now a pundit for BT Sport, he made played one final time at the Boleyn Ground in Mark Noble's Testimonial last season, conceding a goal to his opposite number Adrian!
Eighteen players have turned out for both Liverpool and the Hammers in the Premier League era, and it is left-back David Burrows - alongside Mike Marsh and Julian Dicks - who share the honour of being the first.
Burrows and Marsh arrived in east London together in September 1993, as part of the deal which sent legendary defender Dicks the other way.
It was with the Reds where Burrows enjoyed the best days of his career, lifting the League championship in 1989/90 and FA Cup two years later.
After 146 league games for the Anfield side, he moved to West Ham, where 29 further games in a single year followed before he headed back up to Merseyside with Everton.
He didn't score many goals in his career, but one which will always live long in the full-back's memory came for the Hammers against one of his future employers - Liverpool.
Of course, that came in the unforgettable 2006 FA Cup final, which ultimately ended in heartbreak for the Hammers on penalties following.a pulsating 3-3 draw.
One of only 16 career goals for the Barking-born Hammers fan, he scored two in total across two seasons in Claret and Blue.
Later on, he would play 18 games for Liverpool in 2010/11, following Roy Hodgson to Anfield after a successful time in west London with Fulham.
He may have only made one substitute appearance as he made his way in the game in Claret Blue, but he would go on to enjoy a garlanded career on Merseyside.
The Glasgow-born Republic of Ireland international's career was a slow-burner, with spells at Fulham and Oxford following his time with the Academy of Football.
But after winning the League Cup with Oxford, a move to Liverpool in 1987 saw him pick up a brace of League titles, two FA Cups and the same number of Charity Shields.
73 international caps and a winner against Italy in a 1994 FIFA World Cup game later, Houghton gained much following that slow start in east London.
Welsh international Craig Bellamy joined the Hammers from Liverpool in 2007, becoming the Club's record signing at the time for a fee of £7.5m.
Injuries restricted his pitch time to 24 league appearances in one-and-a-half seasons in east London, but seven goals paved the way for a move to Manchester City for around £14m.
He would later return to Anfield in August 2011, and totalled 18 goals for Liverpool in 74 games for the Club.