Micky Adams has backed Pompey as play-off contenders.
A run of five successive victories has lifted Steve Cotterill’s men into 12th in the Championship.
The Blues currently find themselves seven points off a play-off spot, having played the same amount of games as Leeds, in sixth.
But for Adams, Pompey are now a ‘strong bet’ to make one of those four positions come the end of the season.
The under-pressure Sheffield United boss brings him team to Fratton Park tomorrow looking for a precious victory.
The Blades find themselves second from bottom and without a win from his 12 matches in charge.
And Adams is clearly concerned over the threat from a resurgent side he regards as genuine challengers for one of those play-off places.
Adams said: ‘Fratton Park is always an imposing place to go. Their crowd make a lot of noise.
‘They’re also in a decent run of form. I watched them play Scunthorpe on Tuesday and although Scunthorpe caused them some problems they didn’t take their chances.
‘It’s going to be a tough game and people forget how many good players they’ve still got in their squad.
‘Pompey are safe. In fact, the run of form they’re on means they’ll feel they are strong bets for the play-offs.
‘They’ll look where we are and, having had Scunthorpe, think it’s a six-point run.’