Martinez does not want to see the 19-year-old burn-out this season but says he will have no problem in resting the academy graduate if necessary.
"When you detect fatigue you need to give him a rest and leave him out completely," Martinez told the Liverpool Echo. "A bigger problem than physical fatigue is mental fatigue. He is only 19 and can cope with anything from a physical point of view.
"Going away with England, wanting to get in the winning mentality of the group, means the whole country is watching you.
"You need to understand that is draining at times and we saw that against Hull.
"I couldn't be happier that he takes everything in his stride. That shows he is a mature boy and will never change the way he is."
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