Fernando Morientes warned Real Madrid another club would snap up Monaco star Kylian Mbappe if they fail to do so.
Mbappe, 18, is widely expected to make a record-breaking move in the off-season, with Madrid linked to the forward.
"When you talk about these types of figures, it's usually because the player has generated a certain level of expectation. If you don't buy, another will," he told Efe.
"It's difficult to digest, but when a player is tempted by so many clubs, it's because he has a lot of talent."
"He is just a kid, still in the process of maturing," he said.
"The weight of responsibility will be on his shoulders."
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