The Irishman was was brought down five minutes after the restart by a Fleetwood player in a challenge that looked a clear foul.
However, referee Alan Young deemed Curtis’ actions to be simulation and handed the scorer of Pompey’s first goal today a yellow card.
It’s means he’ll now sit out Tuesday night’s visit of Oxford and Accrington’s trip to Fratton Park next weekend.
And it left Pompey boss Danny Cowley dumbfounded by the call made by the match official.
'I think Ronan has got great personality,’ said Cowley.
'He's got a booking now which means he's got a two-game ban, which is just ridiculous because he get absolutely wiped out.
'He gets wiped out and he gets booked for simulation, which is beyond laughable really.
'He's a big player for us and we'll obviously miss him.'
The Blues welcomed back Joe Morrell for the visit of Fleetwood, following his three-match suspension for a straight red card against Oxford earlier this month.