City rejected their massive £40 million offer for Tevez last night.
"It is a big deal and a tough deal, because it is one of a very big nature and it might not be simple," Kia Joorabchian told Sky Sports News.
"We wait to see. First and foremost we have to respect that City have to make a formal answer.
"If they do accept, then everyone will be running to make it happen. If they don't we will have to see what other options would be available for him.
"Carlos has a lot of respect for City but unfortunately his wife and daughters have not been able to adapt.
"They have lived in Manchester for just over four years and last year they found it very hard. They returned to Argentina and the situation was very difficult for Carlos from a family and personal perspective.
"He decided he would like to move somewhere where his wife and two daughters would move with him, and where they would find it easier to adapt, whether that was in Europe or somewhere else."