Zigic's displays have caught the eye of teams across Europe with the 26-year-old netting 13 goals in his first season in Spain last term.
The player's agent Milan Calasan, along with his UK business partner John Viola, is brokering a deal for Zigic and he confirmed City were interested in signing in the big forward.
"I have been to England and there have been some proposals for Nikola," Calasan told skysports.com.
"There is interest from Manchester City and we will see what happens.
"Manchester City are an interesting club and Mr Eriksson is a very good coach."
Santander president Francisco Pernia has confirmed City are at the front of the queue for Zigic
"We have had interest from six clubs, but it is Manchester City who are the team that has come closest to what we think is the right deal for the club. But the deal is not yet done," Pernia is quoted as saying in the Mirror.