Former Arsenal star Theo Walcott had a word of warning for a prodigy this week.

Walcott knows all about being in the England squad as a tender teenager who has not yet fully matured.

While he is impressed by the quality of Manchester United teenager Kobbie Mainoo, he had a warning for him as well.

"I didn't have any experience in the Premier League as well," Walcott told talkSPORT.

"It is very different but he is starting to establish himself at one of, if not, the biggest clubs in the world.

"For me, from what I've seen of him as well and going off my experiences, obviously we are quick to jump on new talents coming through, but he is exceptional, he really is.

"But let's dampen the expectations just a little bit, because as a man of experience who went to a World Cup at a young age and didn't play, the eyes are on you.

"And they always will be on you. But for me, he is going to be knocking on that door pretty soon."