Born in Wysokie Mazowieckie, Załuska began his career in 1997 with Ruch Wysokie Mazowieckie but left within a few months to join MSP Szamotuły. After a year, he moved on to Sparta Oborniki, before spending time with Zryw Zielona Góra. In 2001, Załuska moved to Stomil Olsztyn and made his first appearance in the Ekstraklasa in August 2001. In 2002, he joined Legia Warsaw but made no appearances for the club. From here, he had two loan spells with Jagiellonia Białystok before joining Korona Kielce in 2004. Załuska spent two years with Kielce, culminating in a Polish Cup runners-up medal in just before moving to Scotland in May 2007.
Dundee United
Załuska joined Scottish Premier League team Dundee United on a two-year contract on 30 May 2007. He played in pre-season for United but suffered a broken foot before the start of the domestic season, prompting the club to sign countryman Grzegorz Szamotulski as a short-term replacement. After returning to training in late October, it was feared Załuska had broken his foot a second time in early November. Załuska finally made his competitive debut for United on 26 January 2008, just days before Szamotulski's departure. United won 2–1 in what was captain Barry Robson's final match for the club. In February 2008, after helping United beat Aberdeen in the semi-final of the Scottish League Cup, Załuska was reported to the Scottish Football Association for making gestures to the Aberdeen fans. In the match, both keepers faced missiles thrown by sets of opposing fans, including plastic cups, chocolate and £1 coins. Referee Iain Brines was also hit by a coin thrown from the Aberdeen supporters' end. A month later, Załuska received a £500 fine and a warning from the SFA for his actions. On 17 December 2008, it was reported that he had declined a new contract and would be leaving the club at the end of the season after the current one expires.
Celtic
On 23 December 2008, Załuska signed a pre-contract agreement with Celtic and would be joining at the start of the 2009–10 season. He officially became a Celtic player on 1 June 2009. He made his debut on 21 September 2009, in a 4–0 League Cup victory over Falkirk. On 25 October 2009, he made his league debut for the Hoops against Hamilton Academical as a replacement for his injured compatriot Artur Boruc and pulled off several saves in a 2–1 win. On 10 April 2010, Zaluska played in a Scottish Cup semi final for Celtic at Hampden Park which they lost 2–0 to Ross County. At the start of the 2010–11 season Załuska became Celtic's first choice goalkeeper after Boruc left for Italian side Fiorentina. However Celtic signed Fraser Forsteron loan from Newcastle United and Załuska once again became second choice goalkeeper. At the start of the 2011–12 season Załuska became Celtic's first choice goalkeeper after Forster returned to Newcastle United. He started the opening SPL game against Hibernian, keeping a clean sheet in a 2–0 victory. However, Celtic's re-signing of Forster on loan again pushed Zaluska down the pecking order. On 29 September Zaluska started in the Europa League against Udinese. Although Zaluska played well and made several good saves, the match finished 1–1 with Udinese scoring from a penalty. After Forster was sold to Southampton, the recently acquired Craig Gordon established himself as first choice for season 2014–15. In October 2014, Załuska was injured in an apparent assault in Ashton Lane, in Glasgow's West End. Having only made two league starts by October, Zaluska kept a clean sheet in a 1–0 league defeat of Inverness CT on 1 November 2014. Zaluska, an used substitute in the 2015 Scottish League Cup Final victory, did come off the bench in a Scottish Cup semi final defeat to Inverness on 19 April 2015. With Craig Gordon sent off in the second half for a last man challenge, Zaluska couldn't stop the resulting penalty to make it 1–1, Celtic would go on to lose 3–2 in extra time. He next played at McDiarmid Park keeping a clean sheet with a string of fine saves in a 0–0 league draw. He left Celtic in June 2015.
On 9 June 2017 he signed a contract with Pogoń Szczecin.
International career
Załuska was called up to the Poland squad for the first time in August 2008, following Artur Boruc's suspension, although he remained unused. He was called up again in November, with Boruc missing due to injury. He won his first international cap on 6 June 2009, against South Africa.
