Due to a late delivery, some Pompey fans will need to collect their tickets for the Boxing Day game at Gillingham rather than receiving them in the post.
This will only affect supporters who have ordered seats in the Lower Tier of the Brian Moore Stand.
Anyone whose ticket(s) will not be sent out in the post will be emailed directly by the Pompey ticket office.
They will be able to collect their ticket(s) from main reception at Fratton Park from 9am on Saturday, which will remain open until 6pm after the Sunderland game.
Any tickets that have not been collected can be picked up from turnstiles 20-21 at Gillingham on the day of the game.
Pompey fans can still buy tickets for the League One fixture, which kicks-off at 1pm. Click here for more details.