Real Madrid's Champions League dreams are on life support after a costly 2-1 defeat to Bayern Munich at the Santiago Bernabéu. The Spanish giants now face a monumental task: they must travel to the Allianz Arena and secure a victory next week to keep their European campaign alive.

The match turned on defensive errors, with goals from Luis Díaz and Harry Kane exposing familiar frailties. The opening goal just before halftime was particularly damaging, stemming from a sequence that left goalkeeper Andriy Lunin stranded.

The spotlight has fallen squarely on defender Trent Alexander-Arnold, whose role in Díaz's opener drew fierce criticism from pundits. Former Manchester United captain Roy Keane did not hold back in his assessment, expressing clear frustration with the England international's recurring defensive lapses in big games.

"I'm fed up," Keane stated. "It's the same story in every important game. People talk endlessly about his passing, but what about the fundamentals? At this level, you simply cannot switch off like that. It was a basic error, letting Díaz go past him as if he wasn't there. For a player of his experience, it's not good enough."

Alexander-Arnold's defensive vulnerabilities have been a talking point for years, meaning Real Madrid knew the risks when they signed him. This high-profile mistake now raises a major selection dilemma for manager Alvaro Arbeloa ahead of the decisive second leg. Will he stick with Alexander-Arnold's creative upside in Munich, or turn to the defensive reliability of veteran captain Dani Carvajal? The choice could define Real Madrid's entire season.