There's absolutely nothing to suggest he was available in the summer.
He only became available cos the player himself was agitating for more gametime.
Pretty sure he knew the score around his playing time behind Kane in August

Hence why I think if we genuinely think he's a 19 year old capable of digging us out a crisis we should have tried then. But we didn't which makes me think we don't actually think he's that awesome.
But I could be wrong