Following the end of his playing career, Fornalik began a managing career. He was in charge of
Górnik Zabrze and
Odra Wodzisław in the early 2000s. He won the bronze medal with
Ruch Chorzów in the
2009–10 Ekstraklasa season. In the 2011–12 season, he led Ruch to second place, the highest placement since winning the title in 1989. In July 2012, Fornalik became the coach of the
Poland national team after the dismissal of
Franciszek Smuda. On 16 October 2013, after a 0–1 loss to
Ukraine in
Kharkiv, which confirmed that Poland would not be going to the
2014 World Cup finals in
Brazil, and a 0–2 loss to
England at
Wembley Stadium the previous night,
PZPN sacked Fornalik due to not fulfilling his contract objectives. On 19 September 2017, he became the manager of
Piast Gliwice. Under Fornalik's rule, Piast turned into overachievers, consistently competing for spots in the upper half of the table, which resulted in winning the championship at the end of the
2018–19 season, finishing third two years later and two short-lived European campaigns. On 25 October 2022, following a poor start to the
2022–23 campaign, Fornalik left Piast and was replaced by
Aleksandar Vuković two days later. On 29 November 2022, Fornalik was announced as the new head coach of
Zagłębie Lubin, agreeing to a contract until the end of the 2023–24 season. He extended his deal for a further year on 26 June 2024. On 22 September 2024, Zagłębie suffered a 1–5 away loss to
Raków Częstochowa, leaving the club in relegation zone with eight points after nine rounds of the
2024–25 season. The following day, Fornalik was sacked by Zagłębie's board. On 6 August 2025, Fornalik returned to Ruch Chorzów for his third stint as manager. == Managerial statistics ==