The Brazilian has struggled to produce his early season form in 2014, but Martino has lavished praise on the former Santos youngster.
"Neymar had a very good game against Manchester City [in the last 16 of the Champions League]," the Argentine told reporters on Saturday.
"I will repeat something I said: Neymar is one of the five best players in the world. I don't need any middle party to confirm his qualities."
Barcelona travel to Real Madrid this evening.