Liverpool manager Jurgen Klopp says there is plenty to come from Alex Oxlade-Chamberlain as he challenges the midfielder to be more of a goal-scoring threat.
Oxlade-Chamberlain, 24, will return to Arsenal on Friday for the first time since his summer switch to Liverpool, in which he cited career progression as the reason for his move to Anfield.
Having netted twice for his new club, in six full seasons at Arsenal the England international's best goal-scoring tally in a campaign was just six goals.
"He is still a young player," Klopp is quoted as saying by the Liverpool Echo. "It's unbelievable but he has 10 or 12 years yet to come in his career. If he was already complete by now then he would be [Lionel] Messi. He is the only player who was complete at that age. Now he can improve and that's fine.
"He has the potential. For all the qualities he has, his goal-scoring record can improve. But it's not that I can give him a number and say he has to score 15 times a season or something like this. He has obvious skills -- shooting, both feet, passing, speed. Where's the limit? I don't know.
"That's why I said players can always improve and that's the obvious thing where Ox can improve. It's not a criticism and if it were, I would have told him already.
"It's not criticism. It's just obvious potential which is there and we will work on it. If it's shooting it's fine, if it's passing it's fine, crossing, whatever. These are things we know he will be better at in the future."
The versatile Oxlade-Chamberlain has mainly been used as a central midfielder or a right-sided forward during his brief time at Liverpool.
Prior to his move in the summer, Oxlade-Chamberlain finished his career at Arsenal by playing in a defensive wing-back role.
"He came here and we spoke about the position," Klopp said. "If you asked him, the only position he didn't want to play anymore is wing-back, but just like 'Milly' [James Milner], if you asked him to do it he would still do it.
"But even that is a different position, it depends on the style of play. He can be much more involved offensively and much better protected defensively. So for me, and for Alex, it's not a big issue if he is a winger or a midfielder. It only means that he has to learn.
"His main skills are offensive, that's true. But you see the situation against Bournemouth where he won the ball against [Jordon] Ibe, he got up and it is so quick it's unbelievable. He is down and up like that.
"He is such an athlete and that's all good. He learns every day. But he isn't discussing positions with me. We just try to give him more and more information about what we expect, and in the moment he enjoys it -- in both positions."