Celtic will put Nicolas Kuhn through a medical in London on Monday before confirming his signing early in the week, according to the latest Sunday reports. It’s been known for a while that the Bhoys have been in negotiations with Rapid Vienna for his signature but a breakthrough has been made today and the player has travelled to go through the final stages of his transfer. Sky Sports Germany journalist Florian Plettenberg reports this afternoon that Kuhn has already arrived in London ahead of tests tomorrow, with a final agreement reached between Celtic and the Austrian club. It’s said he wil…