The former Barcelona right-back questions the sought-after Brazilian starlet's mental toughness after another disappointing showing for Santos in their 2-1 defeat to Corinthians
The young Brazilian striker failed to make an impact in the first leg of the State Championship final, with the former Barcelona and Chelsea full-back adding to his growing list of critics.
"Normally he does not play well against Tite, who have a game plan much like in Europe. With two lines of four he is well marked, there is always cover behind the player marking Neymar; this just neutralises him," Belletti told SporTV.
"Neymar is broken very easily when he realises that the game is not for him.
"He has hardly appeared in the game [against Corinthians], he is not feeling confident enough to take on the responsibility that he assumed, and assumed well. This is lacking right now for Santos."
However, the 36-year-old gave Neymar the benefit of the doubt, placing some of the blame on the rest of the team.
"He does not have a player that divides that responsibility with him," Belletti added. "Previously you had Ganso, who shared some responsibility of this marking."