The Brazilian has advised his old club to pursue the Dutchman during the transfer window, claiming defensive reinforcements are a necessity
Manchester United "need" to sign "solid" Ajax defender Matthijs de Ligt this summer, according to Kleberson.
The Red Devils finished sixth in the Premier League last term, conceding a whopping 54 goals in the process.
Ole Gunnar Solskjaer's men only managed to win two of their final 12 matches across all competitions, with fans and pundits highlighting a shaky defence as the main cause for concern.
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The Norwegian boss is expected to invest heavily in new recruits while the transfer market is open and Ajax's teenage centre-back De Ligt has been mooted as a possible target.