Jimenez has joined Atletico this week from Club America.
Sanchez said: "Comparisons aren't good. I don't generally like them, and in this case even less. I think that comparing Raúl to me puts the lad under increased pressure and I don't like that. I don't want people putting pressure on him and I won't let them. He has to blaze his own trail in Spain.
"He isn't your average centre-forward. He's a player that creates chances easily and can score with his left foot, right foot and head, even from over-head kicks. He has the necessary skill and talent."
For the big stories and the banter follow us on Twitter: @tribalfootball