The Mail on Sunday says Koeman is ready to go back to his old club Feyenoord to sign up-and-coming Dutch centre halves Kongolo and Van Beek in the summer.
Both are 20 years old and are seen as the future of the Dutch national team.
Kongolo was selected by Louis van Gaal for the Holland World Cup squad and has featured 21 times in all competitions for Feyenoord this season.
Van Beek has made 22 appearances this season for the Dutch club, scoring twice.
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