#5 Thibaut Courtois - Chelsea
Despite Courtois spending three seasons on loan to Atletico Madrid before making his debut with Chelsea, the Belgian player signed for the English club back in 2011. The 25-year-old Belgian shot-stopper is the club's longest-serving player on paper at 6 years and 6 months, despite the keeper making his Chelsea debut only in 2014.
The Belgian number one has impressed at Chelsea and learned a lot from his three-year loan spell at Atletico Madrid, making him one of the best goalkeepers in the world. Only 25-years-old, Courtois has a long career ahead of him, although, the player might opt for a move away from the English club, once his current contract terminates in June 2019.
Courtois has won two PL titles and a League Cup at Chelsea, while he has won the Spanish League, Copa del Ray, Super Cup and the Europa League during his time in Spain with Atletico Madrid. An imposing figure between the sticks, Courtois is still growing into the complete player and will be around for a long time to come.