One of the reasons Ramos is at Sevilla may also be because previously, Ramos was at this club and perhaps wanted to retire from this club. Indeed, Ramos was a very strong defender in his time. However, age cannot be fooled. no matter what your skills and abilities are, when you are 37 years old, your abilities and durability will not be as optimal as before.
Sergio Ramos is old and the spaniard have no desire to keep exploring his career in competitive league, he just want to settle down and retired in Sevilla who brought him into fame in football. I think that's a wise decision he took, making a return back to Estadio Ramón Sánchez Pizjuán where it all started from. Ramos enjoyed his time and prime as a aggressive defender in Sevilla, Real Madrid and Paris Saint-Germain. He was at his best in Santiago Bernabeu where he begin his journey in football, looking at him presently, there's alot to learn from his game.