#3 Nacho Monreal

Nacho Monreal is a 33-year-old left-back who currently plays for Arsenal in the Premier League. He has also played 22 times for Spain's national side since making his debut back in August 2009.
Once a key member in the Arsenal defence, Monreal has slipped off the radar this season, warming the bench more than he tends to play out on the field. Injury has had a big say in his absence, but that could be attributed to his age.
To make matters worse, Arsenal have openly said that they want to bolster their defence with a few big signings in the summer, which would leave no room for Monreal to be included at all. So, it's probably for the best that he leaves the Gunners this summer and looks for football elsewhere. He has been a great servant to the club and will leave the fans with fond memories.