Jack Clarke is quite tall for a wide player - listed at 5'11" - and we all know the importance Mourinho places on height.
Given the praise for JC's high fitness levels, as well as his ability, (see Ally Gold), and given that Mourinho primarily uses Sissoko as a right-sided midfielder to provide cover when Aurier (or Doherty now as well) pushes forward, I wonder if he is looking to develop JC as a medium term Sissoko replacement.
Clarke clearly offers a lot more going forward than Sissoko, but also he's better at taking on a man than Gedson, whose potential Europa League squad slot JC has won.
If Clarke can be coached into developing the football intelligence to know when to push forward and when to drop in to provide cover, he'd certainly be a more attacking alternative to Sissoko. Plus, from what I've seen, JC's first touch is excellent which would prevent me screaming at the telly a dozen times a match.
Also, with Bale, Lucas, Lamela, Bergs & Sonny all able to play from the right flank, JC is a long way back in the queue to be our starting right-sided attacker.
So, I'm just thinking aloud, but perhaps Mourinho & Sacramento are thinking of moving Clarke into a slightly deeper role as a hard running right-sided midfielder developing an understanding with our attack-minded RBs (Serge & Doherty) of when to stay and when to push forward.