The France and Real Madrid centre-half is a key target for the Red Devils this summer.
United have reportedly agreed personal terms but not a fee, according to reliable sources such as Fabrizio Romano.
"If that happens, I think it's going to be a big, big positive," said ex-striker Cole, per the Daily Mirror.
"He's still very young for a centre-half and has played at the highest level for many many years now.
"He's won numerous championships and Champions Leagues with Real Madrid, World Cup winner.
"So he obviously has the qualities to bring Manchester United forward, so if it happens I think it would be a fantastic signing."
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