Manchester City midfielder Gareth Barry admits his side struggled during 1-0 victory against Swansea City's win was soured by a knee injury to full-back Micah Richards late in the game. There were no other players around Richards when he appeared to twist his knee as he turned to try to clear a cross to the far post. Swansea themselves were dealt an injury blow with goalkeeper Michel Vorm stretchered off after he dived to try to stop Tevez's winner. Until that point Swansea had effectively frustrated City and could have gone ahead moments before when Michu aimed a free header straight at Joe Hart. "To be fair to them, their game plan was good," Barry said. They sat deep and made it hard for us to get the ball to our forwards. City's injuries are now mounting. Already without Maicon, Pablo Zabaleta, Javi Garcia and Jack Rodwell, City lost Aleksandar Kolarov and Micah Richards during the game. Kolarov was removed at half-time with a foot problem but of more concern was the injury to Richards, who left the field in agony wearing an oxygen mask after appearing to twist his knee. The England defender missed the first two months of the season with an ankle injury and was only in his fourth game back. He will now be assessed in the coming days. When asked if it was a bad injury, Mancini said: "Probably, but I hope not. He was tired, it was the third game in 10 days for him. City struggled in the first half but upped the tempo after the introduction of Mario Balotelli at half-time. When asked what he had said to his players at the break, Mancini mumbled a possible joke about shooting "against three or four players." Mancini was however clear when asked about the performance of Tevez, who scored his first goal since September 1. Mancini said: "He played well but Carlos also played well against West Bromwich. He worked hard for the team. It is an important goal and I am happy for him.