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"We are looking forward to the first of at least four busy weeks. Sometimes it's good if you don't have so much time and simply keep on playing the whole time," said Alonso at the start of the press conference. The Spaniard did sound a warning: "We will have problems if we are not 100% on our game against Mainz tomorrow."
The opponents, who have conceded the second least number of goals in the league, are in top form: "They are currently in very good shape. They are very brave on the ball and play with great energy." At the same time, Mainz are also well organised in defence: "They have a fine feeling for when they need to press high when they need to sit back. They've shown that several times against top teams as for example against Bayern Munich and Borussia Dortmund."
Jeanuel Belocian (torn cruciate), Amine Adli and Victor Boniface are still unavailable. Alonso: "Adli can be back with the team by the end of January at the earliest, Boniface could return in the coming week but he needs time to train."
Alonso also had words of praise for Boniface’s fellow striker Patrik Schick: "He not only scores goals but also knows how to defend and knows what a great influence that has on our game." The coach was also positive about defender Piero Hincapie, who set up Schick in the 3-2 win at Borussia Dortmund: "We are very happy with his development. He's a real fighter regardless of position and I'm glad he finally provided an assist for Patrik. He's practiced that in training for a long time."
The home section will be sold out on Tuesday night and 1700 visiting fans are expected to travel from Mainz. There are still a few tickets in circulation on the official Bayer 04 ticket exchange .

Bayer 04 will have to manage without defender Guéla Doué for the time being. The Ivory Coast international sustained a muscle injury to his right calf during the final Werkself training session yesterday ahead of the Europa League clash with Slovenian champions NK Celje.
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For the first time since reaching the final against AS Roma (2–2, first leg 2–0) in May 2024, Bayer 04 are playing another home match in the UEFA Europa League – and they will be wearing their new European kit. On Wednesday 16 September (kick-off: 21:00 CEST), the BayArena will welcome Slovenian champions NK Celje, who appointed a new coach this week following a mixed start to the season. Under the slogan “40 Years Across Europe. Still Creating History.”, the Black and Reds now aim to add the next chapter to their European history, which has seen so much success in recent years. Bayer 04 fans can follow the match on free-to-air TV on RTL, as well as on Sky and Werkself Radio. The matchday news.
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European football returns to the BayArena: Bayer 04 host Slovenian champions NK Celje on matchday 1 in the group stage of the 2026/27 UEFA Europa League. Ahead of the match on Wednesday 16 September (kick-off: 21:00 CEST), head coach Carles Martínez and midfielder Aleix Garcia spoke at the pre-match press conference. The focus was primarily on the great anticipation surrounding the competition and the clear objectives for it – and, given the circumstances, on a last-minute change to the opposition line-up.
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The champions of Slovenia NK Celje are in a European competition for the fourth time in their history. This Wednesday, 16 September (kick-off: 21:00 CEST), the side lead by head coach Vitor Campelos visit the BayArena for matchday 1 in the group stage in the UEFA Europa League. Celje’s last match at the weekend did not go to plan. The lowdown on our next opponents.
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Construction work continues on the ‘Haus der Talente’ on Kurtekottenweg in Leverkusen, where 36 young elite athletes will find a new home from next summer. The building team from Temmink Bau, led by Thomas Wellers, are hard at work. Over the past few days, excavators, wheeled loaders and rollers have removed 2,500 cubic metres of soil to excavate the basement.
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