Martinez is thought to be in contract negotiations with Porto regarding a new and improved deal. But the Chelsea and Gunners target has reportedly reached a stalemate in talks with Porto over the club's desire to raise his release clause from €40m to €50m.
The Colombian international is believed to think that figure could be too high, dissuading interest from Europe's top clubs and scuppering his chances of a big-money move in the near future.
And Martinez has admitted he expects to leave Porto for a significant fee one day.
"The years go by and I expect to someday make a good transfer," Martinez was quoted as saying by Portuguese newspaper A Bola.
"That depends, of course, on the club because Porto is a club well known for selling their players [for big transfer fees].
"Therefore the fact that I stay or leave depends on the decision of FC Porto."
The Colombian international has been in sensational goalscoring form since his move in 2012, bagging 34 league goals in 40 appearances for the Portuguese giants.
Porto have looked to maximise his potential sell-on value by offering him a bumper pay rise in a new contract that looks to increase his release clause to €50m.
But the Chelsea and Arsenal target is yet to agree to the terms - he reportedly has reservations over the release clause.
"We will speak inside the club and will not bring them back outside," Martinez continued. "The fact I have not renewed yet has nothing to do with time.
"If I renew, ok, I will gladly continue at FC Porto. I will continue to give my all to help the team."
Arsenal are looking for a big-name striker to ease the burden on Olivier Giroud, while Chelsea boss Jose Mourinho is thought to be unhappy with the lack of goals from his first-team attacking options.
Porto have a reputation as shrewd negotiators - they extracted £20m plus in deals for Radamel Falcao, James Rodriguez, Hulk and Anderson.