The 25-year-old is unlikely to make his debut before the start of October but Benitez said: “Alberto is improving.
“We were talking before about six to eight weeks and after a few weeks his ankle is much better but he will need time.
“He’s in the swimming pool and in the gym and working with the physios but he’s not jogging yet.
“We cannot put a date on things and it’s important to just see how he progresses.
“We are checking on him regularly and he had a scan in the past week which showed he is much better.
“It’s just a case of keeping an eye on him every day. When he does start to play everyone will see what a clever player he is.”
Meanwhile, Liverpool have confirmed the departure of French goalkeeper Charles Itandje on loan to Kavala FC.
Itandje, who arrived at Anfield two years ago, has only made seven first-team appearances.
The 26-year-old’s loan deal with the Greek club lasts until the end of June next year.
