The Dutch striker arrived at Carrow Road in the summer for a weighty £8.5million price tag from Sporting Lisbon.
Since scoring on his debut against Everton, he has not added to his Premier League tally. City are the third-lowest scorers in the division this season, with only 18 goals in 22 matches, despite the acquisitions of van Wolfswinkel and Gary Hooper from Celtic.
Hughton feels that the former Sporting man needs to adjust to the Premier League and once the forward has settled, the fans will start to see him replicate the form that saw him score more than a goal every two games for the Portuguese outfit.
"Possibly he can try to do too much in other areas of the field and maybe he has to be more selfish in the box," said Hughton.
"But what you have to remember with Ricky is that right now if he had not had his injury problems, he would be in full flow.
"Of course, it is a concern about the strikers. We want to be winning football matches but I know Ricky and Gary are working so hard."
Norwich sit 12th in the Premier League and despite their poor goals return, Saturday's win over Hull leaves them five points clear of relegation worries.
Hughton spent £27million in the summer, and fully understands the pressures that come with shelling out so much on his side.
"The money we paid will always mean there is pressure on him," added the Canaries manager. "We just have to get the formulas right."