The on-loan Tottenham forward is facing several weeks on the sidelines after injuring his ankle in the League Cup win over Doncaster, leaving the Canaries short up front
The full extent of the injury is still being assessed but there are fears that the on-loan Tottenham youngster could even be set for as long as six weeks on the sidelines.
The news is a blow for manager Chris Hughton, who has seen his side score just twice in four league games so far this season.
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"He is being assessed. He will certainly be out for a period of weeks, a month-plus rather than short of that. It is disappointing for us.
"He will be a big loss because he is a young player of fabulous potential. It was a big move for Harry to come here, an exciting move. I feel for him at the moment.
"It is a real disappointment, especially when he was just up and going. He has settled in very well. We just hope it is a shorter period out rather than a longer one."
The 19-year-old made an impressive impact after coming on as a substitute in his debut against West Ham, and his goal-scoring record at youth level and in previous loan spells at Millwall and Leyton Orient seemed to bode well for his future at Carrow Road.