Paul Cook admits he has been left surprised by the number of rival teams who refuse to go toe-to-toe with Pompey.
Yeovil Town were the latest side to adopt a defensive strategy at Fratton Park and left with a point after a 0-0 draw.
And it’s becoming a theme with many visiting League Two sides preferring to get men behind the ball to stop Pompey.
Cook said: ‘I suppose it is a bit of a surprise so many teams are playing this way.
‘But it’s just the way it is. It is not a critisicm of Yeovil – we’ve got to be better.
‘People want you to abandon your philosophy on the game to come up with a magic formula.
‘Probably the way to beat that sort of team is to put a lot of balls into the box and stick a big man in there but we haven’t built a team to do that.
‘When we go with two up front, we are not the best at it.
‘It can lead to your downfall and losing games.
‘Our passing game wasn’t enough to open them up.’
The result saw the Blues drop down to fourth place in the table but the Pompey boss remains upbeat.
And he vowed his side will improve the way they approach similar defensive-minded opponents.
Cook said: ‘We have lost one game in 11 this season.
‘We’re disappointed with a draw but we move on.
‘We are three points behind the league leaders and not playing particularly well in some people’s eyes.
‘I think we are playing quite well. We are just not getting these games that we actually want.
‘I’m not trying to make excuses, so we’ve got to keep coming back and getting better to win games like this.
‘We need to turn possession into chances and goals – that’s my job.’