The Argentine has praised the Barca star, believing his feats to "far outweigh" Cristiano Ronaldo's, while he also says the Catalans are feeling the absence of Tito Vilanova
Messi has been in impressive form this season, netting 38 goals in 25 La Liga appearances so far, and Solari believes the Argentina international is on another level compared to Madrid's Cristiano Ronaldo.
"What's really incredible about Messi is his consistency over the past four to five years. It's practically inhuman to keep going like him," Solari told Sport.
"What Messi has achieved in recent years far outweighs what Cristiano Ronaldo has done. This difference is reflected in the number of Ballons d'Or he has won."
Solari also had his say on Barcelona's struggles in recent weeks, and stated that the absence of Tito Vilanova hurts the Blaugrana.
"There's going to be doubt when a team loses one or two games," he continued.
"The worst thing that can happen to a team is that the players doubt themselves, especially in a situation where the coach is going through a difficult time. That's affecting the team."
Barcelona will be looking to return to winning ways on Saturday afternoon when they take on Real Madrid.