The 28-year-old is also a target for Arsenal as well as Tottenham Hotspur, with the Colombian international likely to be the subject of a Premier League bidding war in the region of £27.5million this summer.
He is now being tipped to depart the Portuguese club at the end of the current season, but his agent admitted earlier that Martinez is favouring a move to the Serie A ahead of England.
The Red Devils recently sent scouts to watch Porto’s game with Moreirense, where they picked up a 2-0 victory over their opponents, with Martinez managing to get himself on the scoresheet.
With the future of Radamel Falcao still uncertain, Louis van Gaal may now turn to the Colombian instead, who is having a very impressive season so far.
The striker has now scored 21 goals in 25 appearances for his side, a huge feat compared to Falcao’s struggling form of only four goals in 17 games.