Leam Richardson backed the sending off of Jonathan Greening in Pompey’s 6-0 romp last night.
Yet York City boss Jackie McNamara disagreed, describing the decision as ‘harsh’.
Veteran midfielder Greening was shown a straight red on the stroke of half-time by referee Iain Williamson.
The Berkshire-based official felt Greening demonstrated violent conduct when he went in on Michael Doyle during an aerial challenge.
Pompey’s captain, who was left in agony on the floor, thankfully didn’t sustain any facial damage in the ugly incident.
Yet, York’s 10-men went on to concede six goals in the second half as Marc McNulty grabbed a hat-trick.
Assistant boss Richardson said: ‘You will never know how important that sending off was, although it obviously was crucial for us because we’ve managed to win 6-0 and have three points on the board.
‘But, if he had stayed on the pitch, who knows?
‘In my opinion he has given the referee a decision to make and I wouldn’t go against it, because it did look like it on the night.
‘In my view it looked like a red card.
‘I think Michael’s teeth took the brunt of it but I am sure he will dust himself down and get on with it.’
However, McNamara took an alternative view as his side lost for a seventh successive time.
York’s boss said: ‘I thought he was going for the header.
‘There was no arm in the air and it looked harsh.
‘Jonathan said he didn’t touch him and I thought the referee reacted to their players.’