Problem is that it's a hamstring injury.
It's either repaired, or it's not. You cannot run thru any sort of hamstring tear or strain.
If he's running, and sprinting, then he's over the injury, but there's a risk of recurrence if he overdoes it, isn't match fit. He is a natural athlete and a young guy, so maybe he's ready to contribute, we can only hope so.
I thought our league chances were gone with Sima's injury, as we saw that they cannot live with his pace. If he's back, our chances at a treble are much higher imho.