Ibrahimovic signed for Manchester United on a free transfer in the summer after his contract with Ligue 1 side PSG expired. The Sweden international has begun his Premier League career in fantastic fashion, scoring three times in as many matches to date.
On Saturday, Ibrahimovic will come up against his biggest challenge yet for Jose Mourinho's men, as the Red Devils face rivals City at Old Trafford.
Former Italy international Zambrotta, who played with the 34-year-old at Juventus and AC Milan, thinks Ibrahimovic will continue to take centre stage this campaign.
“Wherever Zlatan plays he does very well," said Zambrotta.
“He is a winner everywhere he goes.
“He compares with the best players at the moment like Suarez and Neymar.
“I played with him twice and he’s a good professional and has good motivation. I have always liked him.”
Kick-off for Saturday's derby is set for 13:30 South African time.