Several top European sides have been linked with the RB Leipzig star after an extraordinary season which saw him score 35 goals in all competitions for the German side.
And Nkunku, who is under contract until 2024, told Telefoot that he will have to weigh up his options if a big club comes in for him.
He said: "It's no secret. There are clubs interested in me.
"Yes it's flattering, but it's also flattering to have a club like Leipzig do everything to keep me as well.
"I'll have to reflect well and make a decision. The World Cup is on the way and that's another factor to take into account."
When asked how he would respond if his former club PSG made an approach to sign him, he added: "Like I've said, I'll simply have to reflect on it."