We just need someone who can play in place of Kane - however given that Kane will start all big games, its hard to find someone prepared to do that unless they're at the end of their career (eg Llorente) or unproven (eg Arp). We're more likely to find someone like Son who can play as a no 9 or also behind Kane...
I give you Vincent Janssen Seriously if him and Poch haven't had the supposed fall out then using him as the sub for 6 months is an Ok option till the summer. He's a lot more mobile than Llorente and I thought he showed good potential when he played, just had some weak finishing which could have been nerves.