Xhaka has a 30m buyout clause for 2017, so getting him earlier ll make him cost even more. My guess is, that he ll cost 40m at least, but it wont be easy to convince DoS Eberl to consider selling him. Bayern have already shown interest last summer, but Xhaka had just extended his contract until 2019 and Eberl declared him 'unsellable'. The latest comments from Sammer, that they r not interested (at the moment) r not convincing at all.
http://www.spox.com/de/sport/fussbal...n-dementi.html
Besides Bayern, he has been also linked to several clubs of EPL (Arsenal, Liverpool & Co.) so
he is just a muppet dream here and the chances to get him r close to zero.
I also doubt very much, that u can get Mahrez for 20m. Wouldnt be surprised to see United & Co. offering 50m or even more for him, as that seems reasonable for these guys these days.
Both seem to be totally unrealistic targets.