Mat Hummels is one of the most important wing defenders in Borussia Dortmund's lineup. He has been a key player for the team for several years, and his contributions have helped them win numerous titles.

Hummels joined Borussia Dortmund in 2014 from Bayern Munich, where he had previously played for several seasons. He quickly became a key player for the team, helping them to win several Bundesliga championships and the UEFA Champions League in the process.

One of Hummels' greatest strengths is his defensive skills. He is known for his ability to read the game and anticipate opponents' moves, which allows him to make crucial interceptions and clearances. He also has excellent ball control and can play both as a wing back or as a central defender.

In addition to his defensive abilities, Hummels is also a strong offensive player. He is able to create space for himself on the pitch and score goals himself when given the chance. He is also capable of playing both as a winger or a striker, depending on the team's tactics.

Overall, Mat Hummels is one of the most important players in Borussia Dortmund's lineup. His combination of defensive and offensive skills makes him a valuable asset to any team that wants to compete at the highest level.