For a young and talented player like Gavi, This kind of injury is a major setback. He injured the anterior cruciate ligament and the lateral meniscus of his right leg. This injury will require surgery and is expected to keep him out for several months. This doesnt only affect his ability but also affects his mentality.
The fact is Gavi being young it will be hard for him to come back in form not because he will be out of shape but just fear of getting injured but I believe he will be able to get over this early because he has Lewandoski, who has faced a career threatening injury one time and still came out strong now.
However with Gavi long term injury, Barcelona have good news because they will earn much compensation of up to 7.5 million euros regarding with Gavi will absent more than one year. Its balance well or not with Barcelona have loss Gavi until the end of this season but on other side they will earn much compensation from FIFA.
It's still very bad for them what will 7.5 million euros do to get replacement, they are on injury crisis and one of their star players will be out for more than a year. They need to get a replacement and you know the chances of them getting a good replacement is slim because of their financial struggle