Frenkie de Jong is hopeful Netherlands team-mate and Ajax captain Matthijs de Ligt will join him at Barcelona.
De Ligt is one of the most sought-after players in the transfer market, having captained Ajax to the semi-finals of the Champions League despite still being a teenager.
La Liga champions Barca, Ligue 1 holders Paris Saint-Germain, Premier League winners Manchester City, Champions League winners Liverpool, Serie A title holders Juventus and Manchester United are all reportedly interested.