The 21-year-old, who joined from Everton in the summer of 2012, has made just seven appearances for the reigning Premier League champions so far, but played over an hour of City's 2-0 win over Chelsea on Sunday.
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He told reporters: "I got a couple of hamstring injuries and I doubted whether I was just built for it. But I've stayed strong and now I'm back.
"I'm just pleased to be back on the pitch and injury-free. I was in a few good positions [against Chelsea] and probably should have scored a couple, but I was in the right positions.
"I was probably fresh because I haven't played. I've been training really hard and feel stronger than I was before.
"My last start was back in September. I've not really had a lot of opportunities. I've had a lot of injuries. I'm still young, I'm 21, so I'm still maturing body-wise.
"I feel as though the fans have seen a little bit more of me, but there's still a lot more to come in my opinion."