Manchester United have already bid once to sign a top target this summer, and now a second bid is already expected as Ineos push for move. For Manchester United, this summer is all about tightening up the defence after a campaign which saw Andre Onana face more shots than any other Premier League goalkeeper. This is reflected in the club’s priorities with left-back, central defence and defensive midfield all among the positions that the club want to strengthen this summer. READ MORE: Fabrizio Romano names the four positions he’s convinced Man Utd will sign players this summerThe centre-half po…