The Bhoys boss has no doubts regarding the Brazilian's ability to become a global superstar but remains critical of the forward's alleged playacting
The Brazil international has become a key player at the Blaugrana since his summer move from Santos and the Bhoys boss has little doubt that he will make a big impact on the game.
"I think he is going to light up the football world over the next five to 10 years," Lennon stated ahead of Wednesday's clash between Barcelona and Celtic at Camp Nou.
"If he keeps improving, he will be a fantastic player. I think he will be a marvellous player. He is a special player.
"The home game against Barca was the first time I saw Neymar play live and I was very impressed. I think he will be a wonderful addition to the Barcelona team."
Neymar was involved in an incident that saw Celtic captain Scott Brown dismissed in the reverse fixture in Glasgow on matchday two and Lennon still feels Neymar was guilty of playacting.
"I think he is very talented but I stand by what I said after the first game. I did think he made more of the contact than necessary," the Irishman opined.
"I wouldn't say he [Neymar] is doing it all the time at all; I think it was exaggerated in that instance. It is not a major criticism of the player.
"He is perhaps a bit immature like all young players. Young players at home also tend to exaggerate contact."