Isak Johannesson has a release clause allowing him to leave in the upcoming summer. If Fortuna Düsseldorf is promoted, he can be transferred for 7.5 million Euros, and if they remain in the second division, the transfer fee will be 5.5 million Euros. Johannesson was bought for 2 million Euros last summer, so the profit would be at least 3.5 million Euros. Without the clause, his market value would be much higher.