The Daily Express says the Colombian striker is one of Europe's hottest marksmen and several Premier League clubs have been known to be interested.
On his relationship with Porto, Martinez said: "It is they who have to decide what they want to do with me.
"If it is to continue here, or send it to a transfer depends very much on them.
"If something happens, and more than thinking in economic conditions, I think there are opportunities that can be taken.
"But I continue to think of the club and now I leave my future in the hands of God.
"I will only give my maximum and not look to hasten things, because they will happen in due time.
"For now I do not feel the need to talk with FC Porto. I am calm without denying or closing, or trading any possibility that some part of the club is interested in keeping me."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball