Pompey have signed Josh Thompson on a one month deal.
But the 21-year-old will not be available for tomorrow’s meeting with Oldham.
Thompson has torn up the remaining year of his contract with Celtic to make his switch to Fratton Park a reality.
Players outside of England can sign on loan for a minimum period of six months - and Pompey can only bring in additions on a month-long deal until the club’s future is resolved.
That led to Thompson walking away from his deal at Parkhead.
The centre-half has been training with the Blues throughout pre-season.