Leon Barnett has been charged by the Football Association following his sending off against Pompey.
The Norwich defender threw the ball at referee Simon Hooper after receiving a second yellow card for giving away a late penalty.
Greg Halford subsequently stepped up to net from the spot and seal an impressive 2-0 victory for Steve Cotterill's men.
Now Barnett has been charged with improper conduct by the FA and has until 5pm tomorrow to respond.
The 25-year-old had earlier issued an apology for his reaction on the club's website.
He said: 'I went in straight after the game to the referee and the gaffer to say sorry for my actions.
'I knew immediately that what I did was wrong.
'What happened was out of character for me and I wanted to apologise for doing what I did.'
Barnett is already out of next weekend's trip to Coventry through an automatic one-match ban.
Now he will have to wait before knowing the full extent of his punishment and whether he will face further recriminations.