I think the fact that there are so many injuries in Arsenal may only be related to an intense training program. The strength of the players may not be able to handle this during intense and challenging training. Maybe we shouldn't be too hard on the players. The same is true for Real Madrid. These injuries will be very annoying for Arsenal ahead of tough matches.
The reason why players get injured more often than not is because of the schedule, there are too many games and the players obviously feel this fatigue and it can get them injured. We've seen managers like Pep Guardiola and others complain about the schedule, it is even worse for big clubs like City and Real Madrid that have to compete in 3-4 competitions, and have the quality to go all the way, which inevitably means more games.
Well it is what it is anyway, and the players have to play, if there are injuries in the team, it gives a chance to those who are frequently on the bench, they can take the opportunity to prove themselves and fight for a starting place in the team.