The winger left Chelsea for Forest last summer.
He told the Guardian: "I have reached a point where it feels good. I feel sharp.
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"The injury has not taken anything away from me. It was more about getting matches. It feels good in training every day. Many people around me have helped me push myself to the maximum level.
"I have experienced so much already. You look back and think that there will be so much more to come.
"I'm only 23. I can achieve so many great things. Everything is focused on football and making sure I get the best out of myself."