Adan left Atletico for Sporting, where he played with the Swede before leaving Lisbon over the summer.
He told Relevo: "I think he might be more of an Atlético de Madrid player. Physically he is a beast, potentially he is an animal, and then in front of goal he is a killer."
Asked about comparisons with Manchester City star Erling Haaland, Adan was adamant.
"He has that profile . It's true that he's a bit shorter, but in terms of power, determination in the area, he does have that killer quality , of scoring lots of goals, and a spectacular competitiveness every day in training."
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