What the Leverkusen management said in my opinion is just an empty hope by saying Alonso has a contract until 2026 with Leverkusen, I think he forgot if there is a unique clause listed on Alonso's contract that Alonso can leave at any time if Madrid, Liverpool and Bayern Munich want to sign him as coach, and now Bayern Munich have held talks with Alonso, So from which angle does Leverkusen management Fernando Carro be very confident of keeping Alonso next season?
Bayer Leverkusen are fighting in 1.Bundesliga, DFB-Pokal and UEFA Europa League. If Alonso and his players could grab all of them or at least two, I think he might not renew his contract and search for another challenge. If they win Bundesliga title alone then Alonso will try to grab it again and try his luck in UEFA Champions League.
Now winning Bundesliga should not be that hard regarding the achievement done until now, they are required to win 5 out of the 8 remaining games regardless of Bayern Munich results.
In DFB-Pokal, the road to the victory is nicely paved, they are facing east opponents in my opinion in semifinal and the final game.
For UEFA Europa League, it is more challenging. They have good rivals from English Premier League and Serie A mainly. If they could win it they should celebrate it the most
