The 24-year-old’s move to Cagliari will become a permanent €10m deal no later than 1 July, 2024.
Marin’s contract with Cagliari will run until 30 June, 2025.
#Marin è un giocatore rossoblù 🔴🔵
Benvenuto a #Cagliari, Răzvan!
— Cagliari Calcio (@CagliariCalcio) August 31, 2020
However, he struggled at the Amsterdam side and made only 10 appearances in the Eredivisie.
Ajax will therefore be happy to have lost only €2.5m on Marin after his disappointing spell at the club.
Marin remains highly rated elsewhere and several clubs showed interest, with Cagliari deciding to take a punt on the creative midfielder.