The midfielder has returned to City after Ivory Coast's African Cup of Nations campaign came to an end last week.
"We are further behind than we'd like, of course, but all we need to do is think about last season to know what is possible," he told City's website.
"My friends are all here and are happy to see me and we are like a family or brothers who will all fight together - and that is a very important thing to have.
"United have a strong squad and on paper, they have an easier run in than we do but the title race is a long way from finished. It only takes a couple of results to go our way and we're right back in it - I'm sure we'll come back."