Estevao hasn't started for Chelsea in the Premier League since February 10 due to injury.
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"The fans adore Estevao because he’s a magnificent player," said Rosenior.
"We’ve missed him for two months and I think in the games we’ve had he would’ve made a huge difference for us in certain moments.
"It’s great that he looks really fresh and really fit for coming back and he’s going to play a huge part for us from now until the end of the season."
Chelsea face City later today sitting in sixth place, six points outside the top four of the Premier League.