I still can't work out how he got injured.
He made the poor tackle with his left leg, and I couldn't see any impact with his right leg, but that was the one he got treatment on and also the one he grabbed in pain when he pulled up. And when he did grab his right leg, it was the top of his calf he went to. Maybe you could say it was the back of his knee, but it seemed a little too low for that to me.
I really thought and hoped it was a calf strain/tear, but apparently Sky confirmed it was the knee?