Paul McCallum has been hit with a seven-match ban after his red card against Southend.
The Pompey striker, on loan from West Ham, was sent off after an altercation with his opponent in the 2-1 defeat last month.
But on top of the automatic threematch ban for a straight red card for violent conduct, he has now received an additional four matches for his behaviour in the immediate aftermath, when he allegedly made contact with the referee.
The 21-year-old pleaded guilty to the original charge and Pompey will not be appealing the ruling.
The suspension will see him ruled out for all six fixtures in February, having served his first game at Wycombe.
Under the terms of his loan deal, there is no clause to cut short his stay before the end of the campaign.
But he will not be available to play in any matches – including reserve games – until the trip to Northampton on March 3.