Born in Krosno Odrzańskie, Kuszczak previously played for Śląsk Wrocław in Poland, as well as for the German clubs KFC Uerdingen 05 and Hertha BSC, before moving in 2004 to England with West Bromwich Albion.

He subsequently spent three seasons as the third-choice goalkeeper at the club, behind Gábor Király and Christian Fiedler, and failed to make a single appearance in the Bundesliga.

On 10 August 2006, Kuszczak joined Manchester United in a deal involving the transfers of England Under-18 goalkeeper Luke Steele and defender Paul McShane to West Brom.

[8] Due to Dutch keeper Edwin van der Sar's continued good form and Ben Foster's knee injury, Kuszczak was named Manchester United's number 2 for the 2007–08 season.

On 8 March 2008, in an FA Cup tie against Portsmouth, Kuszczak replaced the injured Van der Sar at half-time, only to receive a straight red card for a foul on Milan Baroš 30 minutes later.

He started, however, in the 2010 Football League Cup Final against Aston Villa, which saw him fail to save a penalty in the first minutes of the game, although United went on to win the trophy, after a 2–1 victory.

[14] After leaving Manchester United, Kuszczak made the accusation that Ferguson held his career back – specifically that he was prevented from joining other clubs by inflating his asking price.

[20] Following an injury to Carl Ikeme, Kuszczak made his Championship debut[citation needed] for Wolves against Reading on 7 February 2015, conceding a goal after 20 seconds.

[22] In the eighth minute of stoppage time in the opening match of the season, at home to Reading, Kuszczak saved Orlando Sá's penalty to preserve Birmingham's 2–1 lead.

[25] Manager Gary Rowett brought Kuszczak back into the side for the local derby against Aston Villa,[26] and he retained the starting spot for the rest of the season as the team narrowly avoided relegation.

After a "solid display" against Derby County in September as replacement for the injured Stockdale, Kuszczak expressed his disappointment at having been "dropped without any chance to get back".

During the January 2018 transfer window, there was reported interest from Newcastle United and Derby County, but Redknapp's successor, Steve Cotterill, insisted that he would only leave on Birmingham's terms.

[31][32] When Garry Monk replaced Cotterill in March, Kuszczak returned to the bench, but did not play again,[33][34] and at the end of the season the Polish press reported that he had been told he could leave.

Due to his impressive performances for West Bromwich Albion, he was called up to the 23-man Poland national football team for the 2006 FIFA World Cup.

However, in a World Cup warm-up match between Poland and Colombia on 30 May 2006, he conceded a goal directly from a long punt by the opposition goalkeeper, Neco Martínez.

Kuszczak was named in Poland's squad for UEFA Euro 2008, but was forced to drop out after picking up a back injury and was replaced by Wojciech Kowalewski.

[citation needed] Kuszczak was called up for the 2014 World Cup qualifiers against Montenegro and Moldova in September 2013, filling in for injured first choice goalkeeper, Wojciech Szczęsny, but remained an unused substitute.

[citation needed] Following retirement, Kuszczak moved back to Poland, where he launched a construction company and graduated college with a degree in sports journalism.