Salah is certainly a respectable player, but I don't think Real Madrid would want to sign him. I am 100% sure that they will want to sign young players with high potential such as Osimhen, Leao and Kudus (Kudus is my favourite). Salah will most likely be transferred to one of the underdog teams after playing for Liverpool for a few more years. I don't think he needs a new challenge. He is a football player who has completed his career to a large extent.
Mohammad Salah is surely now turning into 31 after end of this season and Real Madrid is having targeted him for the replacement of Karim Benzema with most chances they will try to have their few youngsters as main for the next season and want to give them support from experience of Mohammad Salah because still he can do good for the next 2 or 3 seasons which is also not bad for them even right now these all are just rumours with most chances they will try with any other youngster who can give them his best for long time with too many players are already available in market specially as we all know Leao and Kudus with Osimhen is also but still things are not clear and how will this all happen we have to wait for this all until end of this season.