The 67-year-old has doubts as to whether the Brazil international can become an instant hit at the Primera Division giants in the coming seasonBarcelona signing Neymar could face a similar fate as Zlatan Ibrahimovic and struggle at the Spanish champions.
Barca shelled out 57 million euros for Neymar earlier this summer, but Sacchi has warned that the Brazil sensation could find it hard to adapt to the style of play at Camp Nou - just like Sweden star Ibrahimovic, who left the club after just one season following his move in 2009.
"I don't know how Neymar will do at Barcelona. At Barca, the style of play is more important than anything else. We will have to wait and see if Neymar fits in," Sacchi was quoted as saying by Marca.
"All I'm saying is that you don't know how something will pan out. Just look at what happened with Ibrahimovic. He had all the talent to play at Barca, yet in the end he did not fit in with the rest of the players."
Ibrahimovic eventually left Barcelona for AC Milan, before joining his current club Paris Saint-Germain in 2012.