Mats Hummels, the German footballer who was once considered one of the best players in world soccer, has suffered a serious injury that could take him out of the matchday squad for several weeks.

The 29-year-old defender had been ruled out of action after suffering a knee ligament tear during his team's recent friendly against Switzerland. The severity of the injury is unknown but it appears to be a serious setback for the player.

Hummels' absence would have been a huge blow for Dortmund and his club, as he was expected to play a crucial role in their upcoming matches. He has played a key role in helping Dortmund win the Bundesliga title last season and is widely regarded as one of the best defenders in the league.

However, with the injury looming, it remains to be seen how long he will be out. Injuries can happen quickly and it is possible that he may need surgery or other treatments to repair the damage to his knee.

Despite the setback, Hummels is still confident that he will be back on the pitch soon. He said, "I'm very excited about my recovery and I'm looking forward to getting back into the game." He added, "It's important for me to get back to training as soon as possible so I can get back into the game."

In the meantime, Dortmund will continue to search for a replacement for Hummels. They have already made moves for other talented defenders, such as Benjamin Pavard and Marco Reus, but they will need to find someone who can step up to replace Hummels in the midfield.

Regardless of whether Hummels will be able to return to action, there will be no shortage of competition for his position in the defense. With his experience and skills, he should be able to compete with any other defender in the league.