The jury is still out on City's title credentials but Martinez is convinced it is only a matter of time before they find some rhythm - and that when they do, they will be genuine contenders.
Asked if he felt City could they win the title this season, Martinez said: "Yes, because the Premier League is getting tighter and many teams are capable of taking points off the top four.
"Chelsea have made a great start, but the season is not going to be decided in the first few months and Man City could easily join that title race.
"They have that strength and talent in that squad. They played one game in the Europa League (on Thursday) and all of a sudden David Silva is back - that is how quickly they can get top players back on form.
"I just feel City will be in that position when December, January arrives and that is the period when you need to peak."