This is based on Bayern's reluctance to sell, with the belief Juventus or Barcelona could be persuaded.
When it comes to Arturo Vidal, there really is nobody better suited to United, not Fabregas, not Strootman, and not Toni Kroos.
The Chilean international is a box-to-box midfielder who combines a tough tackling style with prolific goalscoring.
At 26-years-old, he is approaching his peak years and if United were able to snap him up, it would undoubtedly be the best transfer deal across Europe this summer.
Vidal scored 18 goals this season, 11 in Serie A, and five in six Champions League groups games, with two in the Europa.
He combined that with six assists, and it's no flash in the pan, with 13 goals and 10 assists the previous season.
Vidal won an average of 4.1 tackles per game in Serie A this season, a figure which would better anybody in the United midfield. His 11 Serie A goals is only five shy of the 16 scored by United's entire midfield in the Premier League this season.
Bayern midfielder Toni Kroos by comparison scored just three goals to add to his six assists.
Even if United sign Kroos, they will still need to add a player to give them a greater attacking threat from midfield.
Vidal would accomplish that, and if United have a glimmer of hope that a deal may be possible, this is where they should direct their efforts.