Marko Marin's transfer from Werder Bremen was agreed in April 2012, with the Serbian-born German linking up with his new team-mates at the beginning of pre-season for the 2012/13 campaign.
Marin turned up early to work on his fitness during the summer, and it looked to have paid dividends after some impressive displays on tour in America, and he grabbed his first Chelsea goal on his debut tour game, against Seattle Sounders.
Able to play as a winger as well as a central player, Marin is 5ft 7in (170cm) tall. His progress stalled slightly towards the end of that first pre-season due to a hamstring injury, meaning a wait for a competitive bow.
He made his Chelsea debut during a 6-0 win over Wolverhampton Wanderers in the Capital One Cup, replacing Juan Mata midway through the second half.
His first league start came in the 1-0 home defeat to Queens Park Rangers, although he was replaced by Eden Hazard midway through the second half.
Marin scored his first goal for the club after coming on as a substitute in a 4-1 win against Wigan Athletic in February 2013.
The following July, it was announced Marin would spend the 2013/14 campaign on loan at Sevilla in Spain. His time in La Liga was punctuated by spells on the sidelines due to injury. He did feature more often than not when fit, but those setbacks made it hard to find a rhythm.
His loan spell did end on a positive note for the side when they won the Europa League final, beating Benfica on penalties. Marin came on as a substitute although once again he was forced out of the action with an injury.
In August 2014, Marin moved on loan to Fiorentina in Serie A where he scored twice in four appearances, two as a substittute, switching to reigning Belgian champions Anderlecht in January 2015. His half-season loan there fesatured 7+1 appearances.
Born in Bosnia and Herzegovina, Marin moved to Germany with his family at an early age and became a professional player at Borussia Monchengladbach before moving north to Bremen in the summer of 2009.
He made 87 Bundesliga appearances for the club prior to agreeing to sign for Chelsea, scoring 12 goals. He also played in the 2010 German Cup final when his side lost to Bayern Munich.
Marin played for Germany Under-21s, making his debut for the senior Germany side in May 2008 prior to being part of the squad that won the European Under-21 championships in 2009.
For the senior team, he made two substitute appearances during the 2010 World Cup in South Africa and had 16 caps and one goal to his name at the end of the 2011/12 season.