Walcott was thrown into the media spotlight when the 17-year-old was selected for Sven-Goran Eriksson's squad for Germany despite not playing a first-team match for Arsenal
Bolton boxer Khan, 19, knows all about the pressures of fame having become an overnight star after winning a silver medal at the Athens Olympics two years ago.
But he said if he ever stepped out of line he would expect "a clip round the ear".
"It is hard because you are young. The best thing to say is don't let it get too much - but be yourself," said Khan.
"That is what I did at the Olympic Games as I was the youngest member of the team.
"The best thing I did was stay level-headed and keep my feet on the ground.
"You also need to keep your family support and keep the right people around you.
"It gets harder but I have been brought up by a great family and it has been fairly easy for me. And the training has been getting harder so that has kept my feet on the ground.
"If I get big-headed I am likely to get a clip round the ear."
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