The Colombian playmaker has been one of the star players of the World Cup so far, with five goals and two assists so far placing him on top of the goalscoring charts.
The 22-year-old has emerged as a hugely influential figure for Jose Pekerman's side and scored a magnificent volleyed goal against Uruguay in the second round.
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"I'm convinced he'll join a big club within the next two or three years at the most," he wrote in Marca. "I can't say he's definitely a future Ballon d'Or winner but, if he keeps up this sort of form, why not?
"I'm not the least bit surprised by what James is doing at the World Cup because he played at this level throughout the season," Lopez added. "He got the most assists in the French league and also scored quite a few goals.
"With his dead-ball prowess to boot, he grabs the headlines for what he does going forward but he also puts in a shift defensively.
"At Monaco he often plays out wide, as a winger, but he's also lined up infield alongside [Joao] Moutinho. He's a player who loves mixing up his position, roaming around rather than always staying in the same area of the pitch."