Ipswich Town midfielder Owen Garvan has been told to rest as he attempts to recover from a form of post viral fatigue.
The 18-year-old's pre-season was decimated as a bout of shingles left him below par form-wise and lacking energy.
Garvan played just 20 minutes for Town's senior team in pre-season and has now undergone tests in London to establish the full extent of the illness.
Ipswich do not expect the youngster to be available for selection for at least two weeks as doctors have informed Garvan to take a break from football.
"Owen has been undergoing tests," confirmed Ipswich's head of sports science Dave Williams to the club's official website.
"All his tests have so far been normal so we will have to wait and see what these new tests show up but we're not expecting anything significantly different.
"Effectively the doctors think he has a post viral fatigue syndrome after the shingles, which is a vague diagnosis.
"The results of the latest tests and ultra sound will be discussed but the doctors have suggested Owen has a complete rest.
"It's impossible to say how long he will be out for but it could take several weeks before he has fully recovered."