Leicester put five past City on Sunday to move straight to the top of the English top flight.
Rodri insists Man City "have to learn and improve and keep focusing."
Manchester City midfielder Rodri was disappointed with how his side were beaten by Leicester City on Sunday afternoon.
The Cityzens were stunned 5-2 by the Foxes at the Etihad and Rodri, who joined City last year, said after the game that "football has not been fair to us".
It was the biggest home defeat Pep Guardiola has ever conceded as Blues boss.
Jamie Vardy scored a hat-trick and City conceded three penalties in as the Foxes moved straight to the top of the Premier League table.
"For me, they were lucky," said the 24-year-old.
Speaking to BBC Radio 5 Live, Rodri added: "Football has not been fair to us. Maybe it is our fault, maybe it is their strength - but it is very difficult to explain.
"We did a lot of good things to win the game. A team like Leicester comes here and plays with 11 guys behind the ball.
"I am young and try to learn every game, but games like this - where the opposition do nothing - you are a bit confused. It's not the way I like to play."
While speaking to City's official site, the Spaniard said: “It was a difficult game to read what happened. We made mistakes – but we did the hardest thing and scored the first goal.
“This thing can happen once in a hundred times, but it’s happened
“We have to learn and improve and keep focusing but we're in the beginning of the season.”