I see the U18 match for this weekend has been postponed. I think this gives us a pretty good hint of who is playing Tuesday for the first team.
The team that was picked for last night's U23 game (Kelleher, Williams, Hoever, Van den Berg, Larouci/Lewis, Clarkson, Chirivella, Cain, Elliott, Hardy and Millar - with the possible addition of Curtis Jones), will play vs. Shrewsbury again on Tuesday. The U23s have another game Saturday vs. Arsenal, so I think they will want to field a different set of players there so the team on Tuesday can be fresh.
So Saturday it may be something like Winterbottom, Gallacher, Boyes, Koumetio, Clayton, Dixon-Bonner, Morton, Bradley, Hill, Longstaff, Stewart - and most of those are U18s so, their match gets scrapped for the time being.
Then the stronger team is back on Tuesday for the FA Cup replay. Pardon my geeky meanderings.