And with both Clark Robertson and Marcus Harness expected to make recoveries from the ankle and quad injuries they picked up against Shrewsbury in midweek, boss Danny Cowley looks set to have a full quota of senior players to chose from once again.
That’s a welcome position to be in for any manager, but the question Cowley will be asking himself is: when’s the right time to freshen things up?
He was tempted on Tuesday night for the visit of the Shrews but ultimately stuck to the same side that beat Crewe.
There might be a greater temptation this time around, though, given Donny’s tendency to pack the midfield.
Could that, perhaps, result in Joe Morrell being handed his full Blues debut? We wait and see.
In the meantime, here’s how we think Pompey will line-up on their latest visit to the Keepmoat...
5. Left-back - Lee Brown
Will be constantly looking over his shoulder, with Connor Ogilvie waiting patiently in the background. But Brown's been a key player in the Blues recording three clean sheets in a row in the league. Would be harsh dropping him, although there will be a time when Danny Cowley wants to freshen things up.
6. Midfield - Ryan Tunnicliffe
What an impact Tunnicliffe has made! Three assists and a goal already this season. Tom Naylor, who? I hear your say!
7. Central midfield - Shaun Williams
Keeps things ticking over for Pompey and is a key presence in the middle of the park for Danny Cowley.
8. Central-midfield - Joe Morrell
Is yet to start for Pompey following his move from Luton but could be given his full debut against Doncaster given the home side's tendency to overload the midfield. Pompey could revert to a 4-3-3 formation to neutralise Donny's threat in that area.