I don’t worry about any potential links to Madrid tbh. One thing people need to remember is Madrid only go for the absolute top end talent. In recent years the only PL players they’ve spent big on are Ronaldo, Alonso, Bale, Modric, Courtois and Hazard. These aren’t just good players, this is literally the best the PL had at the time of transfer.
Garnacho is good no doubt but RM won’t be spending £100m+ for just a good/very good level talent. They have players like Rodrygo, Arda Guler and Diaz who are as good if not better than him, talk less of Vini, Mbappe and Endrick who are tier above (potential wise for Endrick).
My main point here is we can just enjoy Garnacho without worrying about him leaving. If he proves to be good to warrant a RM move it means he’s become a nailed on world class player and that should mean good things for us on the pitch. I personally doubt he reaches such a high level but even if it does, it will be many years in the future so there’s no immediate worry.