The winger arrived in January from Middlsbrough.
Emery said: "It's not a surprise, he's showing us his qualities. For different circumstances, he is playing more than we thought at the beginning.
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"One is because he is playing very well, he has been making good performances for us. Also because a player like Jacob Ramsey, who has more or less the same qualities, is injured.
"When you have injuries, it's important to have players ready to play and focus on our tactical ideas. He is learning so quickly."