#6 Stephan Lichsteiner

Stephan Lichsteiner is a 35-year-old right-back who currently plays for Arsenal in the Premier League. He has also played for Switzerland 105 times since his debut back in 2006 - he currently captains the side.
Lichsteiner was brought in last summer and was one of Unai Emery's first signings as Arsenal manager. It's thought that his role was to serve as cover for Hector Bellerin and he did just that when the Spaniard was sidelined through injury, but he's failed to make much of an impact at all in the Premier League.
His age is a huge setback and has meant that he struggles to keep up with the pace of the game. Lichsteiner is also a very easy obstacle to get round for the young, more energetic wingers, who tend to knock the ball past him and run onto it, leaving him in their dust. This has made him a liability for the Gunners.
When he leaves Arsenal this summer, he may play for a side in his home country Switzerland until he retires, as he simply doesn't possess the ability to properly compete in the top divisions anymore.