Kehl told Bild: "Of course, we also addressed the issue internally at some point, but there must be a feasible economic framework. With the transfers we have made, we have invested approximately £87 million ($117m) in new players, similar to last summer. But there is no state, no sheikh, no billionaire behind us. We have to earn our own money and, in the long run, can only spend what we previously earned. We have exhausted our financial possibilities for this transfer period."