The former Real Madrid director of football believes the other Paris Saint-Germain players need to stand up and be counted if Carlo Ancelotti's team is to progress in Europe.
The Ligue 1 leader travels to Spain to take on Valencia on Tuesday night, and Sacchi thinks as the stakes become higher the striker can sometimes fade and the rest of the team will need to make its mark if it is to progress.
"As the level rises, the difficulties increase, and it is clear that he needs help from his teammates," he told France Football. "Individually, Ibrahimovic's talent is not open for discussion. He is not as good as some of the players I have worked with, and I have had a lot of champions. This should only seek to improve the synergy with his teammates."
Ibrahimovic is Les Parisiens' top goalscorer in 2012/13 and has been earmarked as a key figure in the last 16 encounter.