The Sky Blues moved five points clear at the top of the Premier League table with Sunday's 4-1 win over Liverpool.
Despite also having a game in hand on second-placed Manchester United, Gundogan says it is too early to speak about winning the title.
"There are still so many games to play," Gundogan said. "I think we should stay humble, try to take every challenge by itself because the Premier League is so competitive - and maybe the most competitive year that we have had, so it is about every single game and opponent.
"We know we are in a very good moment, but we shouldn't take it for granted and not drop any edge and to keep going to do the stuff we have been doing as good as possible. Then, it can be a great and successful season for us."
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