No panic, he played during 80 minutes two days ago (even if a lot of other Leverkusen's players played too). It's not surprising to not see him on the bench. (i hope he's not injuried...)
This is great for him, he should get starting. With this move a DMF spot may be his to snatch. Hasebe and Endo are showing such bad form(Hosogai as well) that the position is a crapshoot.