Potters officials have visited the HDI-Arena to discuss a transfer for the 25-year old Senegal international but at this stage nothing has been decided.
Hanover general manager Dirk Dufner told BILD that he expects Stoke to make an offer for the £6.9million-rated Diouf but insists his club will only consider it if suits them.
"They (Stoke) wanted to come over and have a personal chat. This is what we have done, they were welcome,” he said.
"We have not reached an agreement. As far as I am concerned, Stoke feel we will automatically agree to a transfer at some point, as the contract expiry date is just 12 months off. But we do not plan to do so.
"I feel they will now consult, and then we will see whether we receive a written offer or not. We would think about that if Stoke agree to what we have told them."