Barcelona chief Robert Fernandez is watching several Ajax prospects.
Robert made a check on Ajax's Europa League clash with Olympiakos on Thursday.
El Mundo Deportivo says four players are on Robert's radar: Donny Van Beek, Vaclav Cerny, Abdelhak Nouri and Matthijs de Ligt.
De Ligt is a centre-half, Nouri and Van Beek are midfielders, while Cerny (19) has managed four appearances this season.