The Atletico Mineiro duo both impressed at the Confederations Cup for their country.
A Bola report that Porto, with money to spend after selling James Rodriguez and Joao Moutinho, are keen to bring the pair to Portugal.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.