I know that young talent seems to be in great demand by big teams and Milan is the first team that I know of that is interested in bringing in Arda Guler. But from the start it seemed like Real Madrid would not let him go even on loan. So I think Leverkusen would be better off looking for another midfielder or right wing considering the chances are very small and even if they are still interested, it would be better to try next season when there are changes that require Arda Guler to leave.
Xabi may be too ambitious to dream of getting Arda to strengthen Leverkusen while he doesn't see the big plan that Ancelotti is designing to dominate the UCL. So 100% Leverkusen have to look for other alternatives to get other young players.
Even though I am also sure that Arda Guler will still be retained by Real Madrid but still, if Arda Guler is on the bench more often then it is very likely that Arda Guler will also ask to leave or just go out on loan. Because after all, Arda Guler really has big ambitions to be able to play in every match, so when Arda Guler doesn't play in certain matches it will make Arda Guler uncomfortable at Real Madrid.
But yes, I'm sure the point is that Ancelotti always gives Arda Guler playing time in every match, because this will make Arda Guler feel comfortable because he feels he is needed for every match that Real Madrid plays. Because, in fact,from last season there were also rumors about Arda Guler who was unhappy because he was mostly on the bench, making the issue of Arda Guler emerging about his departure from Real Madrid.