Deane played 270 games for the club and scored 119 goals, netting 15 in the Premier League.
He believes that 20-year-old Danish youngster Osula has the talent and temperament to shine for the team in the top flight.
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"I've seen the lad, and he has promise," said Deane, per The Star.
"Having looked at him, he's quick and tall and if you can teach him his positional sense, he can be smart in the Premier League.
The games he's played in have been a good learning experience but when I watched him at West Ham, I remember thinking: 'If only he realized what his attributes were'.
He could have used them in that game and been very dangerous."