It would be the best option for Barcelona to sell every player who is prone to injury as in the case you said. Because Barcelona is building a more solid team with players they can rely on, it would be wise for players who are prone to injury to be released before it's too late because Barcelona can also use the money from the sale of Pedri to buy other players at this time.
Who wants to buy with the current conditions? I think Pedri is really unlucky, after recovering he was injured again. Maybe the player who is sold will be cheap if he is injured. This is also a loss for Barcelona. They can't make many transfers but the condition of their players is also injured a lot. I heard that Pedri injured his knee again. Flick faced a difficult situation. I'm actually quite curious about the current condition, I doubt Barcelona is unable to compete with Real Madrid again.
Basically every player has the opportunity to get injured,so we cannot predict which players will get injured and sell them. But indeed, when the player has a long history of injury or serious injury,then this player can be predicted to experience injury again in the future. An example might be about Neymar, who continues to suffer injuries because he has previously suffered serious injuries and also takes a long time to recover. If so, then ofcourse it would be right to sell the player but the problem is, no team will be willing to buy an expensive player when the player is injured.