Martinez is one of the most sought-after strikers in Europe after impressing at Porto since his arrival from Mexican club Chiapas.
The likes of Chelsea, Arsenal and Atletico Madrid have all been credited with an interest in the Colombian, who has scored 47 goals in 65 games in all competitions for Porto.
Porto are thought to be keen to tie down Martinez to a new deal, but the 27-year-old has revealed talks have not started as yet.
"It is they who have to decide what they want to do with me," Martinez told Record. "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."