Federico Valverde struck a spectacular late winner as José Mourinho's men maintained their perfect record in the league phase with a hard-fought victory at the Allwyn Arena.
AEK made a strong start and took the lead in the 12th minute through Aboubakary Koïta, who finished Luka Jović's assist to put the hosts ahead.
Real Madrid responded with increased attacking pressure and found an equaliser in the 32nd minute. Jude Bellingham produced a superb finish to bring the Spanish giants level and restore balance before half-time.
The hosts refused to back down after the restart and regained the lead in the 75th minute. Stavros Pilios finished from Koïta's pass following a quick counter-attack to make it 2-1.
However, Real Madrid responded almost immediately. Three minutes later, Kylian Mbappé found the net from close range after being set up by Denzel Dumfries, bringing the visitors level for a second time.
Just when the match appeared to be heading towards a draw, Valverde produced a moment of brilliance in the 90th minute. The Uruguayan midfielder unleashed a powerful effort from outside the penalty area, sending the ball into the top corner to complete Madrid's comeback.
AEK's Koïta was sent off in stoppage time, further frustrating the home side as Real Madrid held on for all three points.
Real Madrid maintain perfect Champions League record
The victory takes Real Madrid to 12 points from four matches, keeping their 100 per cent record in the Champions League league phase.
Despite conceding twice, Mourinho's side showed their attacking quality and resilience by recovering from difficult situations to secure another important European victory.
Bellingham and Mbappé played crucial roles in the comeback, but Valverde's late strike proved decisive.
Match details
• AEK Athens: 2
• Real Madrid: 3
• AEK scorers: Aboubakary Koïta 12', Stavros Pilios 75'.
• Real Madrid scorers: Jude Bellingham 32', Kylian Mbappé 78', Federico Valverde 90'.
• Red card: Aboubakary Koïta (AEK Athens), stoppage time.
• Competition: UEFA Champions League, League Phase, Matchday 4.
• Venue: Allwyn Arena, Athens.
• Date: Wednesday, 4 November 2026.