Kenny Jackett knows that Pompey cannot afford to wallow in misery following their Saturday lunchtime setback.
His side were three goals ahead at Southend, only for Simon Cox’s treble to complete a remarkable comeback for the hosts.
There is an immediate chance to get that result out of the system when Bristol Rovers visit the south coast on Tuesday evening.
And Jackett knows that a victory is needed to keep the pressure on the in-form sides currently occupying the automatic promotion places.
The Blues boss said: “In football you have to get over setbacks pretty quickly. You can feel down on the Saturday night, but by the time Sunday comes around you have to get on with it.
“It was disappointing at the weekend because we were in a strong position and should have got three points, although only got one.
"Our crowd will be right behind us and looking for the right level of passion and quality."
“We’ve got big games coming up and we’ll be honest with the players on what we did well and what we could have done better.
“The league’s still open, although drawing three in a row is frustrating when we’re trying to keep pace with Luton and Barnsley.
“We’re into the last third of the season now and really need a sprint finish in order to build some momentum.
“Our next three league games are all at home and that’s a big opportunity for us. Our crowd will be right behind us and looking for the right level of passion and quality.”
Rovers are currently battling to beat the drop, with only goal difference keeping them outside the relegation places.
Jackett said: “They’re a big club and they’ve pulled themselves out of the bottom four with a good run since Graham Coughlan took over.
“We all know that there is a talented group of players there and the game we won there earlier in the second could have gone either way.”
Pompey are sweating over the fitness of striker Omar Bogle, who limped off during the draw with Southend.
Jackett said: “Omar suffered a dead leg and is 50/50 for Tuesday night. We’ll make an assessment on him in the morning.
“The only player that we may have back is Dion Donohue and again we will be making a late call on him.”