Arsenal will be without their central defender William Saliba for an extended period, after the France international picked up a back injury at the World Cup, Al Jazeera reports. The club says he will not need surgery but faces a managed recovery.

The injury

The problem traces back to the summer's tournament.

According to Al Jazeera, Saliba sustained the back injury during France's World Cup campaign in North America, and was hampered by it through the tournament, with his training limited. He was substituted during France's 2-0 semifinal defeat to Spain, the eventual champions, and then missed the third-place playoff against England.

Arsenal's own statement, as reported by Al Jazeera, set out the medical position: "Extensive assessments have concluded that surgery is not recommended, but William should now commence a managed recovery programme." The club added that "everyone is fully focused on supporting William to ensure he is back to full fitness as soon as possible." What the club has not given is a return date; it says only that he will be out for an "extended period."

Why it matters for Arsenal

For readers who do not follow the English game closely, the significance is in who Saliba is to this team.

Al Jazeera reports that Saliba made 50 appearances last season, as Arsenal won their first Premier League title in 22 years and reached the Champions League final. A defender who plays that many games for a title-winning side is a near-ever-present, one of the fixed points a team is built around. Losing such a player at the start of a season, rather than in the middle of one, means Arsenal must reorganize their defense before their title defense even begins.

The timing is the sharp part. Al Jazeera notes that Arsenal start the defense of their title against Coventry City on August 21, and Saliba's availability for the opening stretch is in doubt. A champion team's first task is usually to prove the first was not a fluke; doing so without one of its defensive mainstays makes that harder.

The wider point

Saliba's injury is also a small illustration of a recurring tension in the modern game.

Major international tournaments and demanding club seasons overlap, and players who carry a national side deep into a World Cup in the summer can arrive at the new club season already worn or hurt. Saliba played through a back problem to help France reach the last four; the cost of that is now being paid by his club. It is one case, but it is the kind that fuels the long-running argument about how much football the best players are asked to play, and who bears the consequences when their bodies give way.