Jimenez has finally returned to training after suffering a skull fracture last November, but Mason has warned him not to rush back.
"I hope he is okay, I really do," Mason told a pre-match press conference. "I know the emotions and feelings he is going through at the moment with him and his family. The most important thing and the only advice I would give is that your health is the most important thing in this situation.
"To back that up, I would go down a different route in terms of the bigger picture and say maybe more needs to be done with these types of challenges and the perception of these types of challenges.
"I said it for a few years now after my incident. I didn't like to see that nothing has really changed and Raul's as well, the same thing, a same late challenge from behind and the perception hasn't changed.
"Maybe within the rules something needs to be changed. I don't know [what exactly] but from a technical point of view a late challenge from behind with excessive force ticks all the boxes to be a bad challenge, but for some reason with head challenges and injuries, this isn't the case.
"Hopefully going forward this will change. I am optimistic that the Premier League and the PGMOL are listening and it's a matter of time. Hopefully that will change.
"I hope he is okay and returns to play, I really do, but the most important thing for any player is your health. He has a family too so hopefully the conversations he has and the scans he has produce positive results and he can return to the football pitch."
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