However, the Liverpool boss is confident Hamann will stay at Anfield for at least one more season.
"We have been speaking and Didi will be here next season," said Benitez.
"Rick Parry has been speaking to his agent and it could be done any time now. "In my opinion he will be here for at least next season.
"I spoke to the player on Friday morning and he was going to see Rick so we should have news on his contract soon.
"He has had a very good first half of the season and with his experience and quality, I expect him to have a good second half too.
"We want him to stay for at least next season and in my opinion, he will."