The Red Devils were always going to try and retool their squad after a terrible season which saw David Moyes lose his job after just ten months in charge. Now, Holland boss Louis van Gaal is in the hot seat, but he must first complete his duties at the World Cup before assuming the role.
With a number of new players needed to arrest the slump, United will need to be active in the transfer market and unsurprisingly, van Gaal has been linked with a number of Dutch stars - mostly from his national squads - as the 62-year-old is known for bringing many of his compatriots to his clubs.
Yet this time, it's a Dutch player who is looking to leave the club after van Gaal's arrival, as left back Buttner believes that he must move on having not been selected for the Netherlands under van Gaal's leadership.
"Van Gaal never gave me the chance in the Dutch national team, despite being voted man of the match 14 times at Manchester United," said Buttner. "Apparently, he is not very confident about me. So I think this is the right moment to leave."
It's now believed that the former Vitesse Arnhem man is poised to sign for Russian side Dinamo Moscow, and agent Alexander Bursac says that United's pursuit of Southampton youngster Luke Shaw is a clear sign that he isn't a part of the plans at Old Trafford.
"Dynamo Moscow has great plans for the future and they want to challenge for the title. To stay at Manchester United was not an option for Buttner," said Bursac. "In the past two years, Louis van Gaal has ignored Buttner time after time. So what kind of perspective does he have when Van Gaal becomes his new club coach?
"Patrice Evra signed a new contract and with Luke Shaw they want to buy another player for Buttner's position," he added.