Pompey are considering launching an appeal against Luke Varney’s sending off.
Steve Cotterill believes the Blues forward was harshly dealt with by referee Andy Haines against Hull on Saturday.
Varney was brandished a straight red card following a challenge on James Chester in the 78th minute.
It is an offence punishable by a three-match ban.
Cotterill, however, is adamant his player did not warrant a dismissal.
And he is seeking to have the red card overturned.
He said: ‘With it being a straight red, it will be a three-game ban.
‘I need to have a look at whether to appeal, but I am not convinced it’s a sending off.
‘I have asked the referee to consider looking at it again because it’s not a straight red.
‘If he does do that, I will give him huge credit.
‘I think it’s harsh. Luke is not that type of lad – he hasn’t got an ounce of malice in him.
‘He’s cut across the lad with the ball, probably has overrun it a touch and clips the lad on the shins.
‘The lad doesn’t even go to ground. He jumps up, rides it and then goes down because he’s got a bit of rap on his shins.
‘Luke has caught him but hasn’t gone in straight legged, he hasn’t gone studs first – it’s side on. It’s maybe a booking, but I am not convinced it is a sending off.’
Meanwhile, Cotterill has explained Dave Kitson’s KC Stadium absence.
The striker returned to training last week following illness, yet wasn’t in the 16-man squad.
He added: ‘Kits walked off on training on Friday because he took a knock in the rib on Thursday and wasn’t fit enough to travel.’