#2 Ed Woodward
The United executive vice chairman has been blamed in the past for the team's poor transfer dealings. He has been seen to fancy the club's financial stability above actual football related progress.
Yes, it was reported that Ole would get a transfer kitty of over £200 million. That may only be enough to bring in three or four quality players to United against Ole's target of five or six players. Woodward may again decide to crack the whip as he did with Jose Mourinho.
#1 No Champions League
It is no secret that the allure of playing in the UCL appeals to players who want to move. United's lack of Champions League football could cost them in the transfer market.
Target players such as Ajax captain, Matthijs de Ligt, could fancy Barcelona over United. Most of United's other targets have played in the most elite European competition and moving to United next season would be a step-down, and that may influence their decision-making process.