"One of the special things about the Premier League is that anything can happen, nothing is guaranteed," said City boss Pep Guardiola.
"What I saw of Sheffield [United] is a team that's alive, with the body language. It is not easy with the season they have had. That speaks incredibly well about Chris [Wilder], his staff and his players.
"The result at [Manchester] United speaks for itself. Everyone knows how hard it is to win at Old Trafford. What [Sheffield United] do and the reason they are together and still alive is because they have been together a long time and they believe in each other a lot."