# Olympiacos FC Europa League preparations and debut > Live situation record from CLSTR: https://clstr.news/situations/olympiacos-fc-europa-league-preparations > Updated: 2026-09-16T17:50:43.000Z. Sources: 66. Developments: 4. Prior to their Europa League campaign, Olympiacos FC bolstered its attacking options by signing 28-year-old Chadian international striker Marius Mouandilmadji from Samsunspor. The transfer, finalized near the deadline, is valued at approximately 8 million euros plus 1 million euros in bonuses. Mouandilmadji signed a three-year contract to address the squad's need for depth following a serious injury to Ayub El Kaabi. Olympiacos commenced its UEFA Europa League League Phase campaign with a 2-1 comeback victory against Jagiellonia Białystok at the Georgios Karaiskakis Stadium on September 16, 2026. Jagiellonia, making its historic debut in this stage of the competition, took an early lead in the 20th minute through a goal by Kajetan Szmyt—which followed a mistake by goalkeeper Ortega. Olympiacos responded before the halftime break, with Armando Gonzalez scoring in the 43rd minute following a corner kick. Roman Yaremchuk secured the win with an 84th-minute header, assisted by Georgios Freuler. Following the match, Jagiellonia coach Adrian Siemieniec praised Olympiacos as a “high-quality team,” noting their ability to control the tempo and apply intense pressure. While acknowledging the significant budget difference between the clubs, Siemieniec remarked on the incredible atmosphere created by the fans and noted that his side should have fought harder to secure at least a draw. This result carries implications for UEFA coefficient rankings. Due to the loss, Jagiellonia failed to earn points for Poland, allowing the Czech Republic to tie with Poland for 10th place in the rankings. Maintaining high coefficient positions is considered critical for securing direct Champions League qualification for domestic league champions in future seasons. ## Claims - Adrian Siemieniec is the coach of Jagiellonia Białystok. (corroborated by 2 sources) - Jagiellonia Białystok is making its debut in the UEFA Europa League league phase. (corroborated by 2 sources) - The match between Olympiakos and Jagiellonia Białystok is scheduled for September 16, 2026, at 21:00. (single source) - The match will be broadcast on Polsat Sport Premium 1 and streamed on Polsat Box Go. (single source) - Olympiakos's lineup includes Stefan Ortega, Panagiotis Retsos, and Lorenzo Pirola. (single source) - Jagiellonia's lineup features Taras Romanczuk and goalkeeper Sławomir Abramowicz. (single source) - The match will be officiated by German referee Harm Osmers. (single source) - Betting odds favor Olympiakos with a 1.38 win probability, a 4.90 draw, and 7.40 for a Jagiellonia victory. (single source) ## Timeline ### 2026-09-16: Olympiakos defeats Jagiellonia Białystok 2-1 in Europa League opener Olympiakos defeated Jagiellonia Białystok 2-1 in their UEFA Europa League opener. Despite an early goal by Kajetan Szmyt, a late Roman Yaremchuk header secured the win for the Greek hosts. 14 sources. https://clstr.news/cluster/olympiakos-to-host-jagiellonia-biaystok-in-europa-league-debut ### 2026-09-15: Jagiellonia coach Adrian Siemieniec discusses Europa League clash with Olympiacos Jagiellonia coach Adrian Siemieniec praised Olympiacos's quality and intensity following their Europa League encounter, noting the high level of competition and the impressive stadium atmosphere. 2 sources. https://clstr.news/cluster/jagiellonia-coach-adrian-siemieniec-discusses-europa-league-clash-with-olympiacos ### 2026-09-15: Olympiacos FC signs Marius Mouandilmadji and wins Europa League opener Olympiacos FC signed Chadian striker Marius Mouandilmadji from Samsunspor for 8 million euros to bolster their attack. The club also secured a 2-1 Europa League comeback victory against Jagiellonia. 23 sources. https://clstr.news/cluster/olympiakos-agrees-to-sign-marius-mouandilmadji-from-samsunspor ### 2026-09-14: Olympiacos defeats Jagiellonia 2-1 in Europa League opener Olympiacos defeated Jagiellonia 2-1 in their Europa League opener, featuring a decisive 84th-minute header by Roman Yaremchuk to complete a comeback victory. 50 sources. https://clstr.news/cluster/olympiacos-targets-borja-iglesias-to-strengthen-attack --- Cite as: Olympiacos FC Europa League preparations and debut. CLSTR, https://clstr.news/situations/olympiacos-fc-europa-league-preparations