Although Lewandowski, Dembele and Raphinha available for this match against Real Mallorca I think risk when include them in starting eleven tonight because several days later have most important match for Barcelona against with Inter Milan in Champion League. Better left in the bench for Lewandowski and replace by Depay because with second player composition use tonight looks Barcelona easy to defeat Real Mallorca.
Barcelona is being hit by many injured players, no half-hearted five players have to miss some time in La Liga and the Champions League. the scenario you say, it's not going to happen. because Memphis Depay also had to miss out with a hamstring injury during an international match.
So, after all Lewandowski will be the main starter in this match. according to several sources that I read, Barcelona will use a 4-3-3 formation pattern. Raphinha, Lewandowski and Ansu Fati, and put Dembele on the bench.
So, most likely Xavi rested Dembele for the champions league.
Marllorca is not a difficult opponent to beat Barcelona, even though Marllorca played as the host. I'm sure Barcelona will win this game.