With Jozo back we're a different team at the back, but I would give Ajer a run and maybe push Lustig out to RB. Gamboa had a mare against Bayern but let's be honest, he hasn't played in months bar the Dundee game and that was to be expected.
Re Dembele's fitness - it think they're taking precausions, I honestly don't think he has any issues, but better to be safe than sorry with hamstring problems.
We didn't start Roberts or Sinclair against HIbs last time out, I don't that will be the case this time round. I'd start Dembele over Grif (i'd ideally like to see a front 2 though) and Rogic instead of Armstrong.
Lenny will have them pumped up, so we can't take them for granted at all.