In 1949 Daugava Liepāja and Dinamo Liepāja merged to form Sarkanais Metalurgs which, for the next decade, was the strongest club in the Latvian league. In 1949, Sarkanais Metalurgs won both the league and the Latvian Cup. More titles followed in 1951, 1953, 1954, and from 1956–1958. They also won the Latvian Cup three times in a row from 1953 to 1955. In 1954 after beating Daugava Rīga in a match for the chance to play in the Soviet League a united Daugava-Metalurgs club was formed which included six Metalurgs players. In 1954 they competed in the "USSR Class B 1954, 2nd zone" of the Soviet First League the second tier in Soviet football. In the Latvian league the Metalurgs team was made up of mostly the reserve squad. In 1956 Daugava did not include the Metalurgs name in the Soviet League. In 1960 Sarkanais Metalurgs were given a place in the Soviet league and continued playing in the league under various names until 1990. In 1961 the club played as LMR Liepāja.
In 1962 the club changed owners and was renamed Zvejnieks Liepāja. It was considered to be the second team for Daugava Rīga and the club's best players usually had to leave for Daugava. Also if Daugava players needed to have match practice they were sent to Liepāja. In the Soviet league Zvejnieks were usually a mid-table club. With the club playing in the Soviet and not the local league, players from other Republics of the Soviet Union came to play for Zvejnieks. In the 1960s, defender Mārtiņš Lube was the club's captain. Jurijs Romaņenkovs who went on to become the club's coach in 1989–90 played for Zvejnieks in the 1970s.
In 1990 the club was renamed and given the name of a former Latvian club that plated in the 1920s–1930s – Olimpija Liepāja. As Olimpija the club played in the Soviet league in 1990, but in 1991, after Latvia regaining its independence, they played only in the Latvian league and finished in the third place. The Olimpija period saw the emergence of Viktors Dobrecovs at the club. After the breakup of the Soviet Union the first seasons in the newly independent Latvia were difficult for Olimpija as they got financially weaker from year to year.
In 1995 FK Liepāja was merged with FC Dag Rīga to form DAG Liepāja. The club reached the 1995 Latvian Cup final where they lost 3–0 to Skonto FC. Ainārs Linards returned to the club in 1995. In the Latvian league the club finished 8th out of ten clubs in 1996.
In 1996 the club changed owners again and became Baltika Liepāja. In 1996 Māris Verpakovskis, the son of Ilmārs Verpakovskis and future Latvia national football team international made his debut for the club. For some time the club was on the brink of bankruptcy and struggled to stop the best players from leaving the club. However, the club got new funding from the local Metallurgy factory and for the 1997 season at last had a stable budget and ambitious plans again.
In 1998 Metalurgs with Jurijs Popkovs as their head coach finished second behind Skonto in the Latvian Virslīga and each season up to 2004 Metalurgs finished second in the championship. In the Latvian Cup they also lost three cup finals. In 2005 Metalurgs finally became Virslīga champions and won the first title for Liepāja in an independent Latvia since the 1930s. In 2006 Metalurgs also finally won the Latvian Cup. The next league title came in 2009.