He suffered lacerations after his hand was caught in a wheel in the fall at Grudziadz but was told he should be fit to resume racing in 10 days.
However, Hougaard went to hospital in Denmark on Wednesday after a painful trip home, followed by difficulty in sleeping because of the discomfort.
He was kept in hospital for further checks and has been told he may need surgery.
Belle Vue’s Charlie Gjedde, released by Premier League Berwick last week, has joined Newport to replace the injured Kyle Legault. Tweet