Racing Santander Born in
Santoña, Osmar was a product of local
Racing de Santander's youth system. After a loan stint at
CD Salmantino in the
Tercera División he returned to his first club for
2008–09, making his senior debut with
the reserves in the
Segunda División B and being their top scorer; he
suffered relegation the following season. On 8 November 2009, Osmar made his debut with the
Cantabrians' first team, starting in a 2–0
La Liga home loss against
Athletic Bilbao. He was definitely promoted to the main squad for the
2010–11 campaign, but appeared in only 12 more games across two seasons, with the second
ending in relegation. He made his debut on 1 August in a
Thai FA Cup match against
Chonburi FC, going on to win both that tournament and the
Thai League Cup in his first year. Osmar made his debut in the
AFC Champions League on 26 February 2013, scoring in the
1–1 group-stage draw at
Vegalta Sendai. On 1 May, Buriram became the first team from the nation in a decade to reach the knockout rounds of the tournament, and he topped his side's scorers list at three.
South Korea On 31 December 2013, Osmar moved teams and countries again, joining
FC Seoul on a three-year deal and becoming the first Spanish footballer to ever play in
South Korea. He was appointed
vice-captain ahead of the
2015 season, appearing in the all matches and minutes to set a new record for a foreign field player in the
K League 1. Before the start of the
following campaign, Osmar was chosen as Seoul's new captain, becoming the first foreigner in its history to hold the position. He helped his side to win the national title, being the first Spanish player to do so in the process. On 21 February 2018, Osmar agreed to a loan at
J1 League's
Cerezo Osaka. In December, he signed a new three-year contract with Seoul. Osmar left the
Seoul World Cup Stadium at the end of the
2023 season, after not having his contract renewed. During his spell, he totalled 344 games, 25 goals and 12
assists; at the time of his departure, he held the club record for the highest number of appearances by a foreign player and was second only to
Go Yo-han in an all-team list. ==Career statistics==