England boss Thomas Tuchel says there are "no limits" to Marcus Rashford's potential, but warns the Barcelona forward not to end his career thinking "what could have been".
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Thomas Tuchel on Marcus Rashford:
"It's not a question of talent, it's a question of whether he can prove the point at club and international level. Otherwise, he will be disappointed in 10 years at what could have been and what he made of it.
"I think the limit for him is very, very high. Maybe higher than for others. He has the potential - but potential is a dangerous word with high-level sports.
"You have to reach your personal best on a regular basis - that is what is demanded on this kind of level, and that is the challenge for him.
"He can be one of the best in the world because the quality I see in training, the finishing with both legs and with the head. He is explosive, he is fast, he is strong in the air, so where are the limits?
"There are no limits - but the numbers don't reach the potential, it is as easy as that."