Neil Lennon was yesterday appointed as manager of Bolton Wanderers. Integral to his acceptance of the post was that the club hire his long-time assistant Johan Mjällby.
So what do we know about Mjällby?
A contemporary of Lennon at Celtic, 43 year old Johan Mjällby was born in Järfälla, Stockholm, Sweden in 1971. He would spend the next fourteen years with AIK Solna, his boyhood club, establishing himself in the side with solid performances as a no-nonsense tackling midfield player who was equally capable of playing as a defender.
After 135 appearances, he moved to Scotland to sign for Celtic for £1.2m in November 2008, making his debut in a 5-1 victory over arch rivals Rangers. It would however take until 2000 for him to win his first title for Celtic with a League Cup win over Aberdeen.
The 2000/01 season saw Northern Irishman Martin O'Neill replace Kenny Dalglish as manager - and kept Mjällby in the side. He went to pick up a further three medals as Celtic won the Domestic Treble of the Scottish Premier League, League Cup, and Scottish Cup.
In 2001/02, Mjällby won another Scottish Premier League winners medal along with a first experience of Champions League football in matches against FC Porto, Juventus and Rosenborg. 2002/03 saw Celtic, with Mjällby as prominent figure reach the final of the UEFA Cup. They lost out to FC Porto 3-2 aet. Celtic also went on to lose the Scottish Premier League and League Cup to Rangers.
Season 2003/04 was Johan's last at Celtic Park after struggling with injury throughout most of the season he decided to turn down Celtic's offer of a one year deal.
Mjällby went on to try his hand in Spain's La Liga with newly promoted side Levante UD. However only made three appearances for the side before announcing his retirement due to long-standing injury. Despite this, he would again sign for AIK Solna but again soon succumbed to injury and was forced to retire for good in May 2006.
Four years later, Mjällby was confirmed as assistant manager at Celtic alongside caretaker manager and former teammate Neil Lennon following the sacking of Tony Mowbray as Celtic manager. That July both he and Lennon were appointed in their roles on a permanent basis.
Great success both at home and abroad followed until 2014 when Lennon stepped down from his role as manager, taking Mjällby with him. The pair were reunited yesterday when Lennon was given the honour of becoming Bolton Wanderers manager.