However, they hit a stunning vein of form over the Christmas period and never looked back, winning the title by 12 points.
Guardiola said the 3-1 win over Chelsea at Stamford Bridge in January was a key moment.
Asked how his team did it, Guardiola said: “Win games, game after game.
“I think when we won at Stamford Bridge we realised that suffering in the last month, the performance we played there with just 14 players we realised we are still here, we can still do this. We are still here.
“I think December until March we won all the games in all competitions. This is when we became champions.”