Porto striker Jackson Martinez is aware of transfer interest swirling around him while he's with Colombia's World Cup squad.

Manchester United, Atletico Madrid and Arsenal have all been in touch with Porto about a price for the Colombia international.

Martinez said: "I have heard that there are talks, but no agreement and my representative will engage in it. I'm focused here (in Brazil) and after the World Cup I will deal with any issue.

"I think I've done a good job for Porto. Now I am getting the opportunity with the national team to show what I can do."

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