According to Givemesport, Spurs see the 24-year-old as an important player and are planning for next season with the winger.
It is understood that any attempt to sign him would take a fee of approximately £ 50 million, which can be reluctantly accepted.
Kulusevski has been a rare clear spark in a gloomy Tottenham season, scored ten goals and offers ten assists in his 42 games in all competitions.
The Sweden International was absent in the defeat of Spurs against Chelsea on Thursday due to injury.
Ange Postecoglu's remain in the 14th with only 34 points of their 30 games and are on track for their worst Premier League finish.
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