The 27-year-old has netted 43 goals in 53 appearances since joining Dragoes from Mexican side Chiapas last year, leading to links with Liverpool, Napoli and Real Madrid.
The Portuguese champions are said to be desperate to tie the Colombian to a new contract, but he has played down talk of staying at the Estadio do Dragao.
However, Martinez suggested that he will not agitate for a move, insisting that he will respect the wishes of the club.
"The years are passing and one day I hope to make a good transfer," Martinez told Portuguese newspaper Record.
"It clearly depends on Porto, a club that sells its players so well. Leaving or staying depends on Porto, but I will only go if there is something concrete."
Martinez has scored eight goals in 23 appearances for his country.