The 19 year-old has penned a deal to 2029 with Dinamo.
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The Romanian giants have paid a knockdown €400,000 to sign Mazilu.
Brighton technical director David Weir said, “Adrian is keen to play and this move provides him that chance. It’s a good move for all concerned and we wish him the best of luck for the future.”
The winger joined Albion from Farul Constanta in January 2024, before spending the second half of that season on loan with Vitesse Arnhem.