Real Madrid have been dealt a major setback ahead of the final stretch of the season, with Kylian Mbappe now a serious doubt for the upcoming Clasico after suffering a hamstring injury.The French forward was forced off during the 1-1 draw against Real Betis, and medical tests have confirmed a problem in the semitendinosus muscle of his left leg. With the decisive clash against Barcelona on May 10 approaching, Madrid are facing an anxious wait over their most important player.Mbappe’s absence would be a huge blow at a crucial moment. Only Harry Kane has a better goals tally than Mbappe this season. In a title race where Madrid already trail Barcelona by 11 points, losing that kind of firepower could prove decisive.There is also a wider concern beyond the club season. With the 2026 FIFA World Cup just weeks away, Mbappe’s fitness will be closely monitored by France national football team. While the injury is not currently considered long-term, any setback at this stage raises questions over match sharpness heading into the tournament.Madrid are already dealing with injuries in key areas, and this latest blow only adds to the pressure. Without Mbappe, they lose not just goals, but their main attacking reference point.At a defining stage of the season, both Madrid’s title hopes and Mbappe’s immediate future now depend on how quickly he can recover.