Sadio Mane doesn't have a history of serious injuries so far, but a week before the world cup started he had to accept the fact he couldn't play for Senegal in this world cup. Regardless from Sadio Mane, many players failed to strengthen their country's national team due to injury, even England has many players who missed the World Cup due to injury.

I think changed the schedule for the World Cup which is usually held after the league  over is the main problem that causes many players to get injured, they have to play with busy schedule for the club and one week of recovery time I think is not enough to prepare with the national team.