The 65-year-old former England striker and broadcaster has been full of praise for Bellingham, who's been on fire at this summer's tournament, having scored six times for Thomas Tuchel's side.
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Lineker believes the sky is the limit for Bellingham in an England shirt.
He said: "He could end up becoming England's greatest ever footballer".
Bellingham, currently level on goals with star striker Harry Kane, scored twice to knock Norway out in a 2-1 victory and set up a World Cup semi-final between England and Argentina in Atlanta this evening.
The Real Madrid star will look to conjure up more heroics against Messi's Argentina to send England to their first World Cup final since they won the tournament in 1966.