Monaco are ready to meet the release clause of Porto and Argentina defender Nicolas Otamendi, reports Portuguese daily A Bola.
The Ligue 1 club were interested in bringing Otamendi's partner at centre-back, Eliaquim Mangala to the south of France but reportedly baulked at the €50m release clause that the Frenchman has installed in his contract.
But Otamendi's release clause lies at a mere €30m and Monaco boss Claudio Ranieri doesn't see enough of a difference between the pair to justify the extra €20m.
The 25-year-old has been with Porto since 2010 and is ready to leave if the right offer comes along.
It would be the third time in a year that Monaco have dipped their hands in to Porto's bucket of talent.
The summer transfer window saw João Moutinho and James Rodríguez leave Portugal to join the revolution at Monaco for a combined fee of €70m.
Otamendi has been in impressive form for Porto over the last 18 months and has also attracted interest from Chelsea, Manchester United and Barcelona.
United manager David Moyes is looking to reinforce the defence at Old Trafford as long standing defenders Nemanja Vidic and Rio Ferdinand are approaching the end of their illustrious careers.
Similarly, former Porto manager Jose Mourinho needs to find a long term replacement for John Terry at Stamford Bridge and it is believed Otamendi was high on both their lists.
Barcelona were believed to have sent scouts to Portugal to run the rule over the Argentinian as well.