"The news is certain, but the subject is in the hands of the agent," Zizinho revealed. "We would prefer much discretion until the end of the season.
"We will not decide, but Barca know the situation as we have had contact with sporting director Txiki Beguiristain.
"Our objective now is for him to finish the season with Barcelona at a good level and then we will speak."
Zizinho then confirmed that City were amongst a host of English clubs in the hunt.
"Other English clubs have demanded information about Giovani but the main chance is City," he added.