Kenny Jackett wants to see more creativity from his attacking players.
Brett Pitman netted his third goal of the season from the penalty spot to help Pompey secure a 1-1 draw against Walsall.
That came after Luke Leahy had fired the Saddlers ahead just moments after the start of the second half at Fratton Park.
Curtis Main and Nicke Kabamba were brought on to bolster the hosts’ forward line and it was a foul on the latter that led to the equaliser.
But Jackett feels that his side should be troubling opposition defences more to take some of the pressure off Pitman.
The Blues boss said: “I was pleased with how we battled back and didn’t fall away after conceding the goal.
“It looked a penalty to me. Nicke was just about to strike it with his left foot and then he was taken out.
"We’re looking for players to go past their men, create openings and get shots away."
“The substitutions gave us a more physical presence because we didn’t really have enough going forward.
“We’re looking for players to go past their men, create openings and get shots away – we didn’t see enough of that.
“The changes gave us more of a threat in attack, aided Brett, lifted the crowd and helped us deservedly get back in the game.
“We need to come up with people who can score goals and provide assists around Brett. We need those contributions.”
Walsall’s goal was the third time already this season that Pompey have conceded moments after the interval.
Jackett said: “It happened for us in the Rochdale game just after half-time and now it’s happened against us in three matches.
“We have to concentrate and make sure we come out right. We need to be switched on and make sure we’re the ones who get our noses in front.”