Real Madrid goalkeeper Courtois suffers season-ending knee injury, backup Lunin to take over as club eyes replacements

Courtois tore his ACL during training and requires surgery that will keep him out for months.
Courtois' injury is a major setback for Real Madrid as he is a key player.
Backup keeper Lunin will likely replace Courtois but has limited experience.
Real Madrid is actively looking to sign a new goalkeeper before the transfer window closes.
Sevilla's Bounou has emerged as Real Madrid's top target, but the club is exploring alternatives due to his high price.