Messi hasn't been his usual self since returning from a hamstring injury.
"In your head, you have the feeling that you can have a problem again, it's a little bit difficult, but I'm sure that little by little, Messi is going to again be the player everyone knows," said Suarez.
"Once he sees that he doesn't have any physical problem, he will be the player he has been before.
"The injuries play in your mind, but once you notice that nothing bad happens, then everything is solved.
"It's only a matter of time until he starts to play without thinking that he can have another injury."