If Slimani is valued at more than 20m, we wont be going near him. I suspect Rafa will be able to get someone better in for that, even in the age of daft transfers.
Dubravka is going to cost us around 4m IIRC.
No one knows on Kenedy. We might get him back on loan but if a bidding war starts, we will get blown out of the water by someone like Everton (who have more money than brains).