Sturridge had hip surgery in New York on Tuesday in the hope of improving his poor fitness record this season.
"We anticipate that Daniel will be back, hopefully to train around about September," said Liverpool boss Brendan Rodgers.
"Obviously it is long period of time out but we hope the problem and issues have been resolved with the operation.
"We hope he is available to train in September and then it is about getting his fitness in.
"It is not just about fitness but football fitness, and that takes a bit of time," he added.
"The important thing will be to let him recover, work hard in his rehab and we have great support from our owners in that he is able to go to the world's leading specialists in America.
"He will work very hard to get back fit and the sooner the better for us.
"He has been a big miss to us this season but let's hope he can get back fit and contribute to the club.
"Once he's fully fit we know what he can produce and if he is at that level of fitness he can certainly be a key player for us."