Steve Cotterill saluted Jamie Ashdown’s record-breaking display – but admitted Pompey had ridden their luck along the way in establishing it.
The Blues managed to keep out Bristol City for 40 minutes last night before Albert Adomah broke the deadlock.
By then, Ashdown had already chalked up 636 minutes without conceding.
That broke a post-war club record in the league, created by Peter Mellor in the 1978-79 season, by five minutes.
However, Ashdown failed to reach the all-time post-war best of 654 minutes in all competitions, also set by Mellor.
Nonetheless, for Cotterill it signalled the end of a record bid which had proven to be a distraction.
And he conceded good fortune had played a key role in the achievement.
Cotterill said: ‘I suppose that record has been hanging around our neck for a little while.
‘If we were to be brutally honest, in some of those clean sheets we’ve kept we might have conceded a goal or two.
‘What happens is eventually it catches up.
‘We conceded two last night – one is our own fault, one is not quite our own fault.
‘But we might have had a decision that has gone the other way for us and we have got away with one.
‘Maybe against Scunthorpe, for instance, when they scored a perfectly-good header.
‘So maybe we got away with that and got burnt with one last night.
‘That’s what happens. The the law of averages says something is going to happen.’
Not since the visit of Derby on February 5 had Pompey let in a goal before last night as they chalked up six clean sheets on the bounce.