The prolific Colombian has scored 58 goals at club level since the summer of 2012 and has been tracked by a number of Premier League clubs, including Chelsea, Arsenal and Tottenham.

Roma, who have enjoyed a great season in Serie A and are set to return to the Champions League next term, are keen to make Martinez their marquee signing this summer.

However, the 27-year-old's representative, Guglielmo Lara, denied suggestions negotiations are underway, claiming Porto will not consider any sale until the end of the season.

Porto are currently experiencing domestic struggles - they are third in the Portuguese league table and could miss out on qualification for next season's Champions League.