Sterling, formerly of Chelsea, made his debut in victory over Telstar on Sunday.
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The winger, however, struggled in his second-half substitute appearance, having not played any competitive football at Chelsea this season.
Sterling was criticised for his low-key performance online, provoking an angry response from his former England and City teammate Grealish.
He posted: "What a f***ing stupid Instagram post. Man, what’s wrong with you guys?
"Guy hasn’t played or trained for so long. People like you guys are what’s wrong with the world. Have some respect.”