We'll see over the next couple of weeks and whether the plan has been always been to target Dembele's inclusion for the return. He hasn't played in 3 straight matches since the Getafe cameo.
Playing at Camp Nou, however, Barcelona are a very different animal. I expect them to win but I usually expect this. I am just curious to see what Valverde's larger plan is in the context of the CL because they can't really continue to rely on a tepid 4-4-2 as the competition goes on. The key is Dembélé, IMHO. He can provide the width and space to open things up for both Messi & Suarez. Semedo will likely play in the return leg which should free things up even more. I want to see this:
Ter stegen
Semedo, Piqué, Umtiti, Alba
Roberto, Busquets, Iniesta
Dembélé, Messi & Suaréz
There is also a concern with Piqué as he is clearly hobbled and needs to rest so we'll see how that plays out as well