The announcement comes amid a fairytale conclusion to his tenure, one that has seen the Spanish tactician guide Leverkusen to a domestic double and an unprecedented 49-game unbeaten run across all competitions.
With current Real Madrid manager Carlo Ancelotti unlikely to remain at the Bernabéu beyond this season, Alonso is now widely tipped to take the reins at his former club.
The German club had endured its worst start to a Bundesliga campaign since 1979, sitting second from bottom after eight games under former manager Gerardo Seoane.

Blending tactical acumen with emotional intelligence, Alonso reinvigorated a deflated squad and implemented a dynamic, possession-based system that combined attacking flair with defensive resilience.
Alonso's Leverkusen records A 2–2 draw with AS Roma in the Europa League semi-final second leg extended Leverkusen’s unbeaten streak to 49 matches in all competitions, surpassing the long-standing European record of 48, set by Benfica between 1963 and 1965. This incredible run underscored not only the tactical sophistication of Alonso’s side but also their mental fortitude.