Lee Brown was pleased to bring a busy week to an end with a point at Doncaster.
Pompey were second best throughout the first half, but improved after the break and might have come away with the victory.
Gareth Evans was twice denied by top saves and had a shot cleared from the line, while Rovers finished with an outfield player between the sticks following Marko Marosi’s red card.
But after victories at home to Oxford and away to Bristol Rovers, Brown was content with the goalless stalemate.
The full-back said: “I think it’s a very good point away from home at the end of a tough week. To have taken four from back-to-back games on the road is a positive.
“We couldn’t really get our legs going, but it is tough when you play Saturday, Tuesday, Saturday and people don’t always see that.
"We couldn’t really get our legs going, but it is tough when you play Saturday, Tuesday, Saturday."
“We weren’t as sharp as we have been in recent weeks and yet we could still have possibly won at the end.
“There were chances for us, with one of them cleared from the line and on another day those will go in for you.
“The whole team is looking solid and difficult to beat – and you always give yourself a chance when you keep a clean sheet.
“They were pretty routine saves from Craig, but he’s done fantastically well over the first month of the season.”
Pompey were backed by 1,121 supporters at the Keepmoat Stadium and Brown is grateful for their backing.
He said: “The fans have travelled in their numbers and it’s fantastic for more than a thousand of them to make such a long journey.
“I think they can see they’ve got an honest bunch of players who will give everything and they responded to that.”