Kruszyński began his career as a youth at hometown club Unia Tczew, before moving to II Liga club Lechia Gdańsk in 1976. Despite being aged just 16, he made his professional debut in a league match versus Olimpia Poznań on 5 June 1977, coming on as a substitute for Andrzej Głownia after 67 minutes. Kruszyński broke into the team the 1977–78 season, making 23 league appearances and scoring two goals and improving again the following year, scoring 10 goals in 34 appearances. Kruszyński travelled with the club to take part in a friendly tournament in West Germanyin the summer of 1979 and refused to return to Poland with the team, which caused the Polish FA to suspend him for a year. He made 61 appearances and scored 13 goals for Gdańsk.
Kruszyński joined Oberliga Nord club SC Concordia von 1907 in 1982 and departed at the end of the 1982–83 season.
1. FC Saarbrücken
Kruszyński moved back up the German pyramid to sign for 2. Bundesliga club 1. FC Saarbrücken in 1983. He quickly established himself in the team, missing just five league games during the 1983–84 season. Kruszyński made 32 appearances to help Saarbrücken to a third-place finish in the 1984–85 season and though he didn't play, the club secured promotion to the Bundesliga after winning a playoff versus Arminia Bielefeld. Now playing in the Bundesliga, Kruszyński was moved from his forward position back into the defence and made 32 appearances in a poor season which saw Saarbrücken relegated straight back to the 2. Bundesliga. Kruszyński departed the club at the end of the 1986–87 season, after disastrous campaign in which Saarbrücken narrowly avoided relegation to the Oberliga. He made 132 appearances and scored 10 goals during three years at the Ludwigsparkstadion.
Kruszyński remained within Saarland to sign for Bundesliga club FC 08 Homburg in 1987. He made 34 appearances and scored two goals during a disastrous 1987–88 season, which saw Homburg relegated back to the 2. Bundesliga after just two seasons in the top-flight.
Wimbledon
Kruszyński moved to England to sign for First Division club Wimbledon in December 1988 for a £100,000 fee and he became the third Pole to play in the English top-flight. Utilised as a midfielder by manager Bobby Gould, he struggled to adapt to the physicality of the English game. Kruszyński dropped out of contention during the 1991–92 season and departed the club in August 1992. Kruszyński made 71 league appearances and scored four goals during three-and-a-half years with the Dons.
Kruszyński joined Third Division club Brentford on loan for the final eight games of the 1991–92 season. He played in each game in midfield and helped the Bees secure the Third Division championship and promotion to the second tier. Kruszyński signed permanently for a £60,000 fee in August 1992, but managed only eight appearances during the whole of the 1992–93 season, as the Bees suffered relegation straight back to the third tier. Kruszyński failed to see eye-to-eye with manager Phil Holder and was transfer-listed in September 1992, before being fined two weeks' wages for a training ground bust-up with coach Graham Pearce later in the year. His contract was cancelled at the end of the 1992–93 season, after making 16 appearances in just over a year at Griffin Park.
After a deal to move back to Germany fell through, Kruszyński remained in England and signed for Premiership club Coventry City in September 1993. He made just three appearances and departed the club in December 1993.
After a proposed move to Second Division club Birmingham City failed to materialise, Kruszyński joined First Division club Peterborough United in December 1993. He managed just five appearances before departing London Road.
Kruszyński represented Poland at U18 level and was part of the team which finished third at the 1978 European U18 Championship. Kruszyński's decision to play clubfootball in Germany in 1979 effectively ended his international career, due to citizenship issues.
Coaching career
Since 2001, Kruszyński has coached youth players at his coaching school in Ohio, United States. At one time, the school had links with Spanish giants Barcelona.
Personal life
Kruszyński's brothers Bogdan and Andrzej were also footballers.
