Manchester United scouts checked on Porto striker Jackson Martinez last week . The 28-year-old wants to leave Portugal this summer and his club will listen to offers of around £30million . The Colombia international came close to joining AC Milan in January but the club failed to agree a fee . Manchester United scouts checked on £30million-rated Porto striker Jackson Martinez last week . Martinez ( right ) scored as Porto beat Bayern Munich 3-1 in their Champions League quarter-final first leg . Martinez was outstanding against Bayern Munich in Porto 's Champions League semi final first leg victory scoring in their 3-1 triumph . It was his 23rd goal in 31 games this season . United are looking to add two strikers this summer . Burnley 's Danny Ings remains an option , as reported by Sportsmail last month , and they have considered Edinson Cavani who is also a firm target for Juventus . However , Paris Saint-Germain are reluctant to sell Cavani . Aston Villa 's Christian Benteke has been discussed but no approach has yet been made . Chelsea , Tottenham and Everton also sent scouts to watch Porto and Bayern last Wednesday while Manchester City and Juventus scouts were there to watch Alex Sandro , the Porto left-back . Aston Villa 's Christian Benteke ( centre ) has been discussed by United as they look to strengthen in attack .
FC Porto star Jackson Martinez came close to joining AC Milan in January . 28-year-old scored in their Champions League 3-1 quarter-final first leg win over Bayern Munich . Martinez 's goal against Bayern was his 23rd strike in 31 games this season .