"He's an outstanding talent and one of the best - probably the best - player I've ever seen at 18," said Lallana.
"He's won plaudits and gained recognition, and he's good enough to be here today.
"When Gareth was playing with us we were in the Championship.
"For Luke, at 18, to be playing for us against some of the best wingers in the world, that's credit to him.
"I'm really excited for him. He's done unbelievably for us."
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