Chris Tremlett appears certain to be named in England's Test squad on Sunday - but the tricky bit will come when Alastair Cook has to work out how to deploy the fragile fast bowler in the middle.
Tremlett, 32 next month, may be a key weapon for England not just on his home ground in the final Investec Test but in the return series set to get under way in Brisbane in November.
It is therefore of utmost importance to Cook and coach Andy Flower that Tremlett is fit for purpose this winter, and comes to no harm if he does make his return to Test cricket next week for the first time since he was injured against Pakistan in January last year.
England were initially intending to name their squad on Saturday for a match starting at the Kia Oval on Wednesday, but will now do so on Sunday.
It is not confirmed, but a reasonable assumption nonetheless, that the delay - an unusual one, given the squad will be required to assemble in London on Sunday evening - is a consequence of Tim Bresnan's season-ending back injury, and perhaps Kevin Pietersen's ongoing knee trouble.
The latter had another precautionary scan three days ago, and was pronounced available for selection, but it is likely England will name batting cover just in case - which logically should mean James Taylor, in the reckoning in Manchester the last time Pietersen was doubtful, should be so again.
Bresnan's absence is more of a headache, after he did so much with bat as well as ball at Chester-le-Street to help England to a 3-0 lead and therefore a historic third successive Ashes series victory.
England's selectors are therefore in an unaccustomed position this weekend.
There will be no question - and never would have been, for this valedictory match and the chance to impose a 4-0 drubbing on Australia - of asking match-winners James Anderson or Stuart Broad to take a blow.
Bresnan and Graham Onions' injury misfortune leaves only Tremlett, and an apparently still off-colour Steven Finn, on a very short list as the probable third seamer.
Finn, dropped after misfiring in England's thrilling first-Test victory at Trent Bridge, has not even made the squad for the last two matches - Tremlett, as well as Onions latterly, preferred and therefore apparently being primed for a return when the situation dictated.
For Tremlett specifically, though, there is a caveat.
Yes, his home surface is often a good fit for his particular attributes - pace, height and therefore bounce.
But with Anderson and Broad having got through more than 300 overs between them already in four Tests, that third seamer's role is sure to be an onerous one.
England have long had their eyes on Tremlett as a 'horses-for-courses' certainty in Australia this winter, after he took 17 wickets in three matches in their 2010/11 Ashes series victory - including eight in Perth.
They will be loath to set too searching a test for him beforehand, especially in a cause already won this summer.
Circumstances dictate, however, they may have little other choice.
England squad (v Australia, fifth Investec Test at the Kia Oval, starting on August 21, probable): AN Cook, JE Root, IJL Trott, KP Pietersen, IR Bell, JM Bairstow, MJ Prior (wkt), SCJ Broad, GP Swann, CT Tremlett, JM Anderson, ST Finn, JWA Taylor