Pompey face being hauled in front of the Football Association over their disciplinary record.
And it could see them slapped with a £50,000 fine at the end of the campaign.
Ricardo Rocha’s dismissal against Cardiff at the weekend was the club’s ninth red card this season.
In addition, the Blues have now received 82 bookings.
As a result, in terms of the Championship, only Sheffield United have had more players sent off, with 10 red cards.
Meanwhile, just five clubs have picked up more league bookings.
Pompey’s total could warrant a date with the FA’s regulatory commission at the end of the campaign.
According to disciplinary guidelines, a club is liable to be punished if its players accumulate a total number of penalty points, which is 40 per cent or more above the average in the league.
This includes all first-team competitive matches during the season and would currently apply to Pompey.
If a club cannot then provide a reasonable explanation for their record, they will be either warned or fined up to £50,000.
Pompey have been the victims of a number of debatable refereeing decisions of late.
That includes the sending off of Hayden Mullins against Coventry for handball, which the Blues lost on appeal.
Yet the fact remains they have had nine players shown the red card this season.
Seven of those have come in the league, with one each in the League Cup and FA Cup.
These include Richard Hughes (Leicester), Liam Lawrence (QPR), Carl Dickinson (Doncaster), Greg Halford (Watford), Dave Kitson (Brighton), Jonathan Hogg (Doncaster), Mullins (Coventry) and Rocha (Reading and Cardiff).