Although born in Katrineholm, Ericsson grew up in Örebro and started to play football with local clubs Rynninge IK and Örebro SK as a youngster. He moved to Stockholm for work in his late teens and continued his career with IFK Lidingö.[2][3]
He later went on to join Hammarby IF and made his senior debut for the side in 1951, at age 20, in Sweden's second tier Division 2.[4] Ericsson became known as a nimble, technical and quick left winger, that often showed his strengths in counter-attacks. But he also lacked physical strength and was regarded as somewhat inconsistent. His playing-style resembled that of Lennart "Nacka" Skoglund's, who also happened to be Ericsson's favourite player.[2][3]
In 1954, Ericsson moved to rivals AIK in Allsvenskan, the domestic top division.[2] His new club had tried to convince him to join a year earlier,[5] and when the transfer finalised it caused much upset among Hammarby's supporters.[3][6] He would go on to play with AIK for three years in Allsvenskan, making 28 league appearances and scoring 9 goals (two against his former club Hammarby) in total, but failed to win any silverware.[2]
Ericsson returned to Hammarby IF in 1957–58 and helped the club to win a promotion to Allsvenskan from Division 2; the team scored an impressive 117 goals in 33 fixtures throughout the season.[7] He played a major part in establishing Hammarby in the top tier during the next four seasons, playing 63 games and scoring 15 goals,[8] before he left the club in 1962 to become a player-manager for Växjö BK.[9]
He made a brief third comeback for Hammarby in 1963, before retiring from football later that year.[10]
Between 1951 and 1960, Ericsson also played bandy with Hammarby IF and AIK in Allsvenskan, Sweden's highest division. He was part of the Hammarby team that in 1957 lost 2–1 against Örebro SK in the final of the Swedish Championship.[2][3]
In his younger days, Ericsson played handball with IFK Lidingö and won the Swedish Championship with the club in 1948–49, after which he retired from the sport.[2][3]
In 1952–53, Ericsson made a brief appearance as an ice hockey player for Atlas Diesels IF in Division 1, Sweden's highest division, and helped the club from relegation.[2][3]