Leo was critical of Barca after they lost the Liga title to Real Madrid.
According to Alves, the Argentine lacks adequate support at Camp Nou.
"He sees, what I feel, and that's a lack of support," Alves said of Messi during an interview.
"I'll always say that Messi is the main course and we were the perfect ingredients for that plate.
"Now I have the feeling that he's doing everything, all the time, and we must remember he's only human."
Leo will be hoping the Blaugrana get to make up for their league collapse with success in the Champions League.
The Catalans are scheduled to face Napoli for the second leg of their round of 16 clash at Camp Nou on August 8.
Arthur missing as Barcelona announce 16-man squad for Alaves clash
It's the Blaugrana's final league game of the campaign.
Barcelona have released their official squad list ahead of their last La Liga game of the season against Alaves.
Quique Setien decided to leave out Arthur Melo who has already signed for Juventus.
Antoine Griezmann, Ousmane Dembele and Samuel Umtiti won't feature due to injury.
Gerard Pique and Junior Firpo will also miss the encounter through suspension.
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