The teenage midfielder will leave Djurgarden for Tottenham this summer.
"This is a guy with great potential. When you make a move like he has made, to a big club in the Premier League then you have big, big potential. It is very, very good," Tomasson told FotbollDirekt.
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"Nor should we forget the experienced players, who have performed in the national team for a longer period of time.
"As a management team, we have to find the right mix of players."