Ivan Klasnić (; born 29 January 1980) is a Croatian former professional footballer who played as a striker. He began his career with local side FC St. Pauli, and moved to Werder Bremen in 2001 after helping his previous team to promotion to the Bundesliga. He scored 49 league goals in 151 appearances with Werder Bremen, winning a league and cup double in 2004. After a season in France with Nantes, he moved to English Premier League team Bolton Wanderers in 2009, initially on loan. After their relegation in 2012, he spent a season back in Germany with Mainz. Klasnić played also for the Croatia national team. In 2007, Klasnić underwent a kidney transplant, and became the first player to participate in a major tournament (UEFA Euro 2008) after a transplant. He also represented Croatia at UEFA Euro 2004 and the 2006 FIFA World Cup. Club career FC St. Pauli Born in Hamburg, West Germany, Klasnić started his professional career with local side FC St. Pauli, and impressed as a striker in the three-and-a-half seasons that he played for the club in the 2. Bundesliga since becoming a professional in January 1998. Prior to his spell at St. Pauli, he played for less known amateur sides Union 03 Hamburg and TSV Stellingen. Werder Bremen After helping St. Pauli to gain promotion to the first division with 10 goals scored for the club in the second division during the 2000–01 season, he made the switch to Werder Bremen in the summer of 2001 and finally made his mark in the first team in 2003 with some powerful performances in the Bundesliga. His first two seasons at the club had been marked by erratic form (he scored only three goals in 36 Bundesliga appearances) and two serious knee injuries, but he laid old ghosts to rest as he emerged a key figure in Werder Bremen's march to the Bundesliga title in the 2003–04 season, when he also won the DFB-Pokal with the club. He scored 13 goals and made another 11 for his Brazilian strike partner Ailton. His expiring contract caused a scramble for his signature at the beginning of the year before he eventually decided to stay at Bremen. Participating in the 2004–05 UEFA Champions League season, Klasnić scored five goals in the two group matches against Belgian side RSC Anderlecht, including a hat-trick in the 5–1 home victory for Werder