Manchester United have made former City defender Jerome Boateng their top defensive target, [football] direct news understands.The Bayern Munich centre-half, who can also operate as a full-back, endured an injury-hit season at the Etihad Stadium during the 2010-11 campaign before returning to his homeland with the Bavarian giants.googletag.cmd.push(function() { googletag.display(“div-gpt-ad-1389116196215-0”); });He has since established himself at club and international level courtesy of a string of impressive displays in which he showcased his pace and power at the heart of the backline, catching the eye of United scouts.A source close to the Red Devils told FDN they are prepared to splash out a significant sum of money on the 25-year-old, who will still have four years remaining on his contract at the Allianz Arena when the transfer window reopens at the end of the season.Despite lifting the European Cup and Bundesliga title with Bayern, United hope Boateng has a feeling of unfinished business in the Premier League and particularly in Manchester.