Pep Guardiola has acknowledged that the Premier League is a tough competition after Manchester City scraped a 2-1 win away at Huddersfield Town on Sunday.
The Citizens went in at the break a goal down following Nicolas Otamendi's own goal on the stroke of half time.
However, City equalised through a Sergio Aguero penalty and, with just six minutes left of the game, struck the winner through a lucky Raheem Sterling deflection.
"The Premier League is so tough," Guardiola told BBC Sport. "We knew they were so aggressive, so strong, but we are so happy for the way we won.
"We spoke at half time about how to react, we had enough chances to score and the first time Huddersfield had a chance they scored. We spoke about not giving up, to keep going.
"It was a brilliant move to win the penalty. It is impossible to win every game easily, this league is so tough. The guys competed amazingly, which is why we won."
City's win at the John Smith's Stadium is their 11th successive Premier League victory and keeps them eight points clear at the top of the table.
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