Bolton Wanderers take on Millwall in the Sky Bet Championship at the University of Bolton Stadium on Saturday afternoon. With that being said, bwfc.co.uk take a look at a selection of players who have played for both sides involved.
The former England manager started his playing career off at Wanderers in 1973. During his time with the Whites, he was a part of the 1977/78 side that gained promotion to the First Division.
Following his time with Wanderers, the defender headed to Sunderland before joining Millwall in 1981, where he spent two years in the capital.
He had a second stint with the Trotters in the 1985/86 season, before joining Preston North End the following year.
‘Big Sam’ took over as Whites boss in October 1999.
From there, Allardyce enjoyed an eight year tenure at the University of Bolton Stadium.
He took the club into the Premier League in 2001, beating this weekend's opponents at the Millennium Stadium in the First Division Play-off Final.
From there, Allardyce and his Wanderers side enjoyed a successful stay in the top flight of English football.
It was capped off in 2004/05, when the Trotters finished sixth and won qualification to the UEFA Cup for the first time in the club’s history.
Beevers joined Millwall on an initial season long loan deal from Sheffield Wednesday back in October 2012, ironically making his debut against Bolton Wanderers for the Lions a day after signing.
His stay at The Den was made permanent in December the same year and stayed at the club until 2016, making over 100 appearances.
The defender expressed his desire to return to the North of England and subsequently signed for Bolton in July 2016.
In his first season in BL6, Beevers was a pivotal part of the Wanderers side that gained promotion to the Sky Bet Championship in 2016/17.
Along with this, the towering centre back was named in the PFA League One Team of the Year with defensive partner David Wheater and has been a prevalent figure in Phil Parkinson's team this year, scoring four goals this campaign in league and cup appearances.
Branagan joined from Millwall in 1992 and went onto make 263 appearances during an eight year stay with the Whites.
In this period, the Republic of Ireland international experienced three promotions with Wanderers.
Most supporters will remember his penalty save in the 1995 Play-off Final against Reading, which resulted in Bruce Rioch’s side, gaining promotion to the Premier League.
During Davies’ time at Southampton, he was loaned out to Millwall in 2002 where he played nine times for the Lions, scoring three goals.
In July 2003, he signed for Wanderers and the rest is history. Going onto spend ten years at the University of Bolton Stadium, he made 407 appearances (84 goals) before finishing his career with a spell at Preston North End.
He is a three time winner of Wanderers Player of the Year, showing just how valued the physical target man is in BL6.
Whilst at Reading, Karacan was loaned out to Millwall in 2008 for a short loan spell to the then Sky Bet League One club.
The tough tackling midfielder joined the Whites in March 2017, following his contract at Galatasaray expiring.
His impact for Wanderers was a quick one, as in his first start for the club against Peterborough United, Karacan scored the opening goal to put Phil Parkinson’s men in the lead and ultimately saw Bolton return to the Sky Bet Championship.
Nicknamed ‘Zico’, the midfield maestro joined Wanderers in 1991 from Shrewsbury Town for a reported £100,000.
In his three years with the Whites, Kelly made 142 appearances with eight goals to his name.
He was involved in the side that gained promotion to the First Division in 1992/93, where Wanderers finished second in the Second Division.
Following a short spell at Port Vale, Kelly joined Millwall in 1994 for a short spell.
The Scottish international joined Millwall on an initial season long loan with Millwall, which turned into a permanent move after a fruitful goal scoring spell at The Den.
Nicknamed ‘Super John’, the striker joined Wanderers from the Lions in 1992 and from there, the rest was history.
McGinlay turned into a club legend during his time at Wanderers, scoring 118 goals in 245 games.
The frontman had many memorable moments playing under Bruce Rioch and Colin Todd; including cup giant killings over the likes of Arsenal and Everton, scoring the last goals at Burnden Park, winning the First Division in 1996/97 among other highlights.
For the 2006/07 season, Morais joined Millwall on a permanent basis from the club he started his career at in Chelsea.
He made his debut on the opening day of the season, playing against Yeovil Town at The Den.
The wide-man made 16 appearances for the Lions in his one season with the London based side, scoring once against Bradford City.
In February 2017, Morais signed for the Trotters until the end of the season.
It proved to be a masterstroke by Parkinson and co, as the man nicknamed ‘the postman’ provided four assists against Gillingham in a 4-0 victory, as well as winning March League One Player of the Month in his time at Bolton.
He ended with 13 assists for the season, the fourth most in League One and he only played half a season!
He was a great influence on Wanderers returning to the Sky Bet Championship.
In January 2014, Trotter joined Bolton on loan for the remainder of the 2013/14 season.
After making this move permanent in May of the same year, Trotter signed a three-year contract.
He scored his first goal as a fully-fledged Whites player against Rotherham United and made over 50 appearances for the Northwest club.
Prior to this, Trotter enjoyed a four-year stint at The Den, making 150 appearances for the Lions with 25 goals to accompany it.
The goalkeeper joined the Trotters in January 2015 on a month’s loan to compete with Andy Lonergan for the starting spot between the sticks.
Following his loan expiring, Amos re-joined Wanderers on a on a free transfer from Manchester United.
He has made 52 competitive appearances for the Whites to this date.
In July 2018, the shot stopper joined Millwall on loan for the 2018/19 season.