Born in
Quilmes, Buenos Aires, Klimowicz started his career at
Instituto Atlético Central Córdoba in the
Primera B Nacional. He was sold to
Rayo Vallecano of
La Liga in 1996, scoring 11 goals in
his first season but being relegated to
Segunda División; the latter club was later banned from buying or selling foreign players, for failing to pay the accorded sum of 240 million
pesetas. Klimowicz returned to the Spanish top division in December 1997, when he signed a four-and-a-half-year contract with
Real Valladolid. After netting just seven times across all competitions during his spell at the
Estadio José Zorrilla, however, he returned to his country in 1999 and joined
Club Atlético Lanús. Klimowicz was transferred to
VfL Wolfsburg in December 2001, going on to remain in Germany – and its
Bundesliga – for the better part of the following decade. He netted a career-best 15 goals in the
2003–04 campaign, helping his team finish in tenth place. In May 2007, Klimowicz moved to fellow league side
Borussia Dortmund on a two-year deal. On 25 August, his brace was crucial to the hosts' 3–0 home defeat of
Energie Cottbus. He added four goals in their
runner-up run in the
DFB-Pokal, being
booked as a second-half
substitute in the
decisive match, lost 2–1 to
Bayern Munich after
extra time. In the
2008–09 winter transfer window, Klimowicz signed with
VfL Bochum. On 2 March 2010, the 35-year-old announced his retirement from professional football due to a
hip injury; Klimowicz decided to come back from retirement on 24 December 2010, and re-joined his first team Instituto on a one-year contract. ==International career==