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 
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