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.
Quoting from the club's official website, apparently Depay and De Jong were also injured. In addition, Araujo, Kounde and Bellerin also suffered injuries so they all cannot be included in the squad against Mallorca.
Team newsThe Dutch duo of Frenkie de Jong and Memphis both picked up hamstring problems in the game with Denmark. But it’s in defence where things are looking particularly messy. Ronald Araujo noted pain in an adductor in the first minute of Uruguay’s friendly with Iran and has required surgery, while Jules Kounde returned from the French camp with an Achilles tendon issue. And to make matters worse, right-back Héctor Bellerín hurt his calf during training back in Barcelona.
Source Even though Barcelona's injury storm after the International break has cost the club, but I don't think they will be short of players in the match against Mallorca. Barcelona remains the favorite in that match with many other quality players. The problem is, can Barcelona keep their defense from conceding in this match?