Eugenio Lopez - who represents Otamendi - has travelled to Porto where he will meet with Jorge Mendes in the coming days, according to reports in Spain.
It is claimed that Mendes has been tasked with getting Otamendi a move away from Valencia this summer.
And Lopez will now meet with Mendes to fast-track a move before the Valencia squad reconvenes on July 27.
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Nicolas Otamendi is set to leave Valencia
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According to Spanish paper AS, Lopez and Mendes will now strategise how to get Otamendi to Manchester, with the Argentine defender set to choose between United and City.
Valencia are reportedly still insisting that the 27-year-old's £35million release clause is met before he can leave.