City's 2-1 victory over West Ham United was the 20th consecutive win in all competitions and moved them 13 points clear at the top of the Premier League.
“Everyone is so committed and focused," Guardiola said after the West Ham game.
“Every player knows they must play good because another can take his position.
“I am surprised. In the toughest year for society and the world, and the most difficult year for many years across the world, and in the toughest period in England with weather and pitches - to do what we have done is amazing.
“But we don't have titles, we are going to try."