Mikel Arteta was delighted for Eddie Nketiah after his performance against AFC Wimbledon on Wednesday.
The English striker made a rare start in the Carabao Cup third-round clash, and managed to score in the 3-0 victory.
Asked about Nketiah, Arteta said: "Eddie is a lesson every day on how a professional should be in his job in the circumstances.
"There has been a lot of speculation around him. He puts his head down, he trains harder than everybody else.
"He supports every teammate no matter the circumstances. So, I am so happy for him that could perform at that level and physically how he managed that game because he trains like the best every day. So I am delighted for him."
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