Krzysztof Piatek

Piątek began his career with local side Niemczanka Niemcza and Dziewiątka Dzierżoniów (2006–2011). He then moved to Lechia Dzierżoniów of III liga in 2011.

Piątek signed for Zagłębie Lubin in 2013 and initially played in junior and reserve teams of the club. After the arrival of Piotr Stokowiec as the new coach, however, he was quickly promoted to the first team on 14 May 2014 and then made his Ekstraklasa debut on 18 May 2014 in a match against Cracovia. Over the course of the next season, he became a regular starter for Zagłębie, who played in I liga, the second tier of Polish football. He scored his first senior career goal on 12 September 2014 in a 1–0 win to Chrobry Głogów and his first brace on 31 October 2014 at Widzew Łódź. After earning promotion with the club, Piątek scored his first league goal on 14 August 2015 in a 2–1 win against Lech Poznań and helped the team finish third in the 2015–16 Ekstraklasa season, earning a medal and qualifying for European competitions for the first time in club's history since the championship winning team of 2006–07.

In 2016, Piątek joined fellow Polish side Cracovia and over the course of the next two seasons, he scored 32 league goals in 65 appearances for the club. That tally included a haul of 21 goals during his second season which saw him end the 2017–18 Ekstraklasa campaign as the third top goalscorer in Poland.

On 8 June 2018, Piątek signed a four-year contract with Italian club Genoa for a reported fee of €4 million. He scored four goals, including a hat-trick in the opening 19 minutes, on debut in a 4–0 Coppa Italia win over Lecce. He made his Serie A debut on 26 August, scoring in the opening six minutes of the match in a 2–1 win over Empoli. The following week, he scored his first brace of the season in a 5–3 loss to Sassuolo, which was followed by another strike in a 4–1 loss to Lazio, thus becoming the first player since Andriy Shevchenko in 1999 to score five goals in his first four Serie A appearances.

He made his international debut on 11 September 2018, starting in a 1–1 friendly draw with the Republic of Ireland in Wrocław and making way for Mateusz Klich after 61 minutes. Exactly one month later, he made his competitive debut in a UEFA Nations League match against Portugal and scored the opening goal in a 3–2 defeat.

On 23 January 2019, Milan announced the signing of Piątek on a contract lasting until 30 June 2023, for a reported fee of €35 million. He was signed as a replacement for Gonzalo Higuaín, who joined Chelsea, and he was assigned the number 19 shirt, previously worn by Leonardo Bonucci.

Piątek made his debut for Milan on 26 January, in a goalless home draw against Napoli, as a 71st-minute substitute for Patrick Cutrone. Three days later against the same opponents also at San Siro, he scored both goals in a 2–0 win in the Coppa Italia quarter-finals, and was given a standing ovation when he made way for Cutrone. He was voted as the team's Most Valuable Player in the match by the fans. On 3 February 2019, Piątek scored his first league goal away to Roma, which ended 1–1. He then scored three goals in the next two consecutive matches: one against Cagliari Calcio and two against Atalanta, making him the fastest player to score six goals for the club in all competitions, overtaking club legend Nils Liedholm. He also became the first Milan player to score in his first three starts in the league since Mario Balotelli in 2013.

He is married to Paulina Procyk (a lawyer, born 1991). The wedding took place on 1 June 2019 in Castle of the Order of St. John in Łagów (Lubusz Voivodeship).

In January 2020, Hertha BSC announced the signing of Piątek for a reported fee of €27 million, on a long-term contract. He was given the number 7 jersey.