Krystian Bielik

On 2 August 2019, Bielik joined Derby County on a five-year contract. The fee was undisclosed, but reported by the Telegraph as an initial fee of below Derby's record fee paid of £8 million, plus performance-related clauses that could take it "towards the £10 million mark".

He was called up for the 2019 UEFA European Under-21 Championship, at which he scored twice in three matches.

Bielik received his first call-up to the Poland's senior team for UEFA Euro 2020 qualifiers in September 2019. He made his debut on 6 September 2019 as a 70th minute substitute in a 2-0 loss to Slovenia.

A shoulder injury that required surgery prevented Bielik going out on loan in the summer 2017 transfer window, but on 31 January 2018, he signed for Walsall of League One on loan until the end of the season.

On 16 August 2018, Bielik joined Charlton Athletic on a season-long loan. His first senior goal gave Charlton a 2–1 win against Southend United on 1 September. He scored in the League One play-off semifinals against Doncaster Rovers, and was awarded Man of the Match in the final against Sunderland, a 2-1 victory at Wembley Stadium by which Charlton Athletic secured promotion to the Championship.

On 31 January 2017, Bielik joined EFL Championship club Birmingham City on loan until the end of the 2016–17 season. He made his debut in the starting eleven for the visit to Preston North End on 14 February, and played the whole match as Birmingham lost 2–1. His next appearance was ten days later, as a substitute after centre-back Paul Robinson was sent off with Birmingham 2–0 up away to Wolverhampton Wanderers. Bielik partnered Ryan Shotton in central defence as Birmingham conceded once but, thanks in part to his "two last-ditch challenges in the closing stages", managed to hold on for the win. Playing on the right of a back three alongside Shotton and Robinson in mid-March against Newcastle United, Bielik contributed to a clean sheet, a performance that confirmed his place in the starting eleven for the next few weeks and encouraged manager Gianfranco Zola to consider loaning him again in 2017–18.

Bielik was named in Poland's squad for the 2017 UEFA European Under-21 Championship, but did not play.

In early 2015, Arsenal agreed a reported £2.4 million deal for Bielik with Legia Warsaw. On 21 January, Arsenal completed the Bielik deal with the Polish midfielder signing for an undisclosed fee, subject to regulatory processes.

Bielik made his senior Arsenal debut in the League Cup fourth round on 27 October 2015, replacing fellow debutant Glen Kamara after 60 minutes of a 3–0 loss at Sheffield Wednesday. He was a member of the Arsenal under-21 team that reached the 2015–16 U21 Premier League Division 2 play-off final, held at the Emirates Stadium in May 2016, in which they beat Aston Villa U21 3–1.

He first played senior football with Legia Warsaw in 2014, spent the second half of the 2016–17 season on loan at EFL Championship club Birmingham City, and spent the 2018–19 season on loan at Charlton Athletic, helping them gain promotion from League One.

Bielik started playing football for his hometown club, Górnik Konin before being spotted by Lech Poznań scouts in 2012, and later joining their developmental academy. He won the Polish U-17 Championships with the club in early 2014. However, in July 2014, Bielik joined Lech's archrivals, Legia Warszawa for 50,000 zł (£9,000), and on 24 August, he made his Ekstraklasa debut against Korona Kielce.

Krystian Bielik (pronounced [ˈkrɨstjan ˈbjɛlik] , born 4 January 1998) is a Polish professional footballer who plays as a centre back or defensive midfielder for EFL Championship club Derby County and the Poland national team.