Chelsea have begun their rebuilding process by signing 23-year-old Werder Bremen winger Marko Marin for £7million.
Werder Bremen chairman Klaus Allofs confirmed Marin would be moving to Stamford Bridge next season on a five-year deal having passed a medical.
Reports in Germany suggested that Chelsea's Belgian forward, Romelu Lukaku, would be joining the Bundesliga outfit as part of the deal, but Allofs moved to deny the rumours.
Marin is a leftsided player and likely to be a direct replacement for Salomon Kalou, who is out of contract in the summer and expected to leave, and Florent Malouda, who is out of favour.
Marin was born in Bosnia-Herzegovina and moved to Germany when he was two years old. He has grown up in the German system and played 15 times for his country.
Marin has endured a mixed season at Bremen, where he has scored just once in 22 appearances and has been played out of position in central midfield and been injured.
Marin is a gifted winger, who in his earlier years was dubbed as the "German Messi." That comparison was proven premature, but the 23-year-old's strengths and weaknesses more resemble those of Angel Di Maria.
Marin is a very talented dribbler, but stagnated after joining Bremen in 2009. He has primarily been used out of position as a central playmaker, where his dribbling qualities are less noticeable and his underwhelming playmaking vision is evident.
He needs a fresh start, and perhaps he will flourish when used once more on the wing. It is, however, a great gamble for the player, who could find himself on the bench for five years. For Chelsea, €7-8 million is worth the risk.