United have been heavily linked with Leicester star Harry Maguire, as well as Alderweireld, but have been put off by their respective asking prices.
Such is the dire state of affairs, that just a day remains in the window, and United still haven't signed the top class defenders they have wanted for perhaps over a year.
Boateng has been a stalwart in the Bavarians' backline since 2011, winning six Bundesliga titles and a Champions League medal during that time, but had admitted last season that he has accomplished everything with the German giants.
Darke reckons Alderweireld would have been the easiest target for United to go after.
The 2017-18 German champions are rumored to be demanding a 50 million euro transfer fee.
Yerry Mina relishing Everton challenge
New Everton defender Yerry Mina says that he is looking forward to the challenge of competing in the Premier League . I have spoken a lot to the coach and I know his passion for Everton and determination to be successful.
"The other clubs who compete with us are really strong and already have fantastic teams".
The Swedish striker dropped into see his old team-mates during their pre-season tour of the United States last month. Martial was omitted from the squad for Sunday's friendly loss at Bayern Munich. Mainly your side's opening Premier League game against Leicester City, but also a new pink away kit that's nearly certain to divide opinion when it's eventually released.
"Lets get back to the United style of play".
Axel Tuanzebe has rejoined Aston Villa on a season-long loan, following Joel Pereira, Matty Willock, Dean Henderson and Cameron Borthwick-Jackson in making temporary exits from United.