But he didn't "break down" he got a completely new injury caused by a bad fall after a collision with his own keeper, that's bad luck, and I'm sure he'll see it that way.
If it was his calf again then I could see the "break down" argument, let him get over it and see what happens, ironically the new injury might actually help, as he will be further resting the long troubling calf injury.
Oh and 4-6 weeks seems a lot more positive than pre BMG, when it was being quoted as "months", so some good news for him.