Ruud Gullit says Frenkie de Jong has developed at an "unbelievable" rate in the last two years and has compared the Ajax midfielder to Real Madrid great Zinedine Zidane.
The 21-year-old's exploits for Ajax and Netherlands have seen him hailed as one of the most promising young players in Europe.
Barcelona have already agreed to pay the Dutch side an initial €75 million (£65m/$85m) to sign the midfielder this summer, but Netherlands great Gullit says he plays more like their arch rivals' former star and coach, World Cup and Champions League winner Zidane.