Kaide Gordon is on track for the start of preseason at Liverpool.
The teenage winger missed last season due to a pelvic injury linked to his physical growth.
Gordon began training at Liverpool last month.
"What is difficult with certain kind of injuries, especially with younger boys who are growing, they are complicated," U21 boss Barry Lewtas told the Liverpool Echo. "It's not like when you break a bone, then the bone heals and you crack on.
"Some of these injuries are more complex, and unfortunately for Kaide it has been that. It has been linked to his growth, and Kaide is taller and bigger now than when he last played.
"We always knew never to put a timeframe on it as we knew it could be a long one and we didn't want to set his hopes too high, and wanted to keep him in the right frame of mind as well. It's without raising expectations of anybody else as well, as he's a player who has already made an impact in the first team.
"He's been running around the pitch a little bit more, and we'll see how he goes."
More must-reads: