In the absence of any outstanding candidates outside the team, we've got to look at the players who could lay claim to having a guaranteed spot in the XI.
That leaves us with Azhar, Shafiq, Sarfraz, Amir and Yasir by my reckoning.
Amir won't get it because he's tainted by the spot-fixing and he hasn't fully found his feet in tests yet. Yasir won't get it because he's been bowling poorly and his stock is low at the moment, his injury history should also be a red flag.
So that leaves Azhar, Sarfraz and Shafiq. We can rule out Shafiq right off the bat because the other two are already captains in pyjama cricket. Azhar has been positioned as heir to the throne and his runs on this tour have boosted his stock immensely so he's got to be odds-on favourite but I think it will come down to the ODI series.
If we give a good account of ourselves in the ODIs then Azhar will get the nod as test captain. If we get battered then Azhar might get the boot as one day skipper, in which case it becomes difficult for the PCB to turn around and appoint him as test captain.