Kenny Jackett has no concerns about Pompey being a potential target for their League One rivals.
The Blues are two points clear at the top of the table after 16 games, having lost just once in the league all season.
Jackett takes his league leaders to basement boys Bradford City - without a win in six games - this weekend but is not worried about his team being a scalp for others in the division.
He said: 'It's not something I'm worried about (Pompey being a target),
‘I'd rather be top than bottom. Wherever you are you want to be doing better and, most importantly, whatever your position in the league you have to win your next game.
'We're no different and we're trying to improve all of the time.'
Pompey are now over a third of the way through what they hope will be a promotion-winning campaign and Jackett is happy with the club's start.
He added: 'Obviously, we're pleased with the amount of points we've got.
‘The way things have gone, we've been in every single game.
‘Even the loss we had against Gillingham we put the ball into their box an awful lot of times – without success – but during that game I felt, although we were 2-0 down, if we had got a goal with five or 10 minutes to go we could have got something out of the game.
'The positives are we've been in every single game, we've had strong spells in games, similarly a lot of games we've won have been by a narrow margin as well.
'We're pleased with the points total, we're pleased with the position in the table and we want to capitalise on that now.'