Pompey's ticket office is on the move as part of the club relocating their offices.
That means some limited ticket office opening times as they move back to their old base on Frogmore Road, from their current location at Rodney Road.
The office will move to its new home tomorrow but will not be open for the meeting with Millwall on Boxing Day.
Tickets can be collected between 10.30am-12.30pm at the Pompey Megastore.
No tickets can be bought on the day of the game.
There will then be limited ticket office services until January 5.
The office will open on December 29 from (9am-5pm), December 30 (9am-5pm) and the day of the Hull game on January 3 (10am-kick-off).
With just three windows operating during this period, Pompey are advising supporters to use the 'Print at Home' ticket service.
That can be done by visiting eticketing.co.uk/portsmouth or calling 0844 847 1898.
Those buying tickets on the day of the Hull game have been told to expect lengthy queues.
Supporters have been advised not to travel to the clash with Leeds on December 28 without a ticket.
There are no tickets being sold on the day of the game for away fans at Elland Road.
Fans can buy tickets for the New Year's Day televised trip to Watford on the day.
They can be bought for cash only at Vicarage Road on the day for the 5pm kick-off.
Tickets are priced at 27 (adults), 17 (over-65s, students and young adults aged 16-19) and 10 (under-16s).
Tickets for the Watford clash will be sold to personal callers at Pompey on December 29 and 30.
Anyone now using the new ticket office outside of matchdays has been advised to use the car park behind the Fratton End, and access the ticket office from the path at the southern corner of the car park to access Frogmore Road.
Pompey have been given 1,350 tickets for the FA Cup trip to Brighton on Saturday, January 8.