After arriving at United on the back of two consecutive Bundesliga player of the season awards in 2012, there were considerably high expectations of Japanese playmaker Shinji Kagawa.
Two very disappointing seasons later the 25-year-old is now back with former club Dortmund having never showed his true class in the red Manchester United.
In the 38 Premier League games that Kagawa featured in for the Red Devils he scored six goals and made only the same number of assists, which isn't a great return for someone who's job it is to create goals and also score them.
After returning to Dortmund during the transfer window Kagawa revealed that he no longer featured in the United's long-term plans, and has also reflected on 'difficult' second season at United under the tenure of David Moyes.
He told Sky Sports: "My decision was clear, I wanted to return to Borussia Dortmund and only to Borussia Dortmund.
"I want to achieve success with this club again, and with no other. Only facts matter in football, stats, goals, assists, titles, and a lot was missing in this regard.
"That was probably why they no longer included me in their plans.
"Everybody knows that my second year at Manchester United was particularly difficult. The manager did not really count on me, and the team was also on a bad run.
"That means I am all the more delighted to be back. My heart had remained at Borussia Dortmund anyway."
On his second Dortmund debut in front of a packed out Westfalenstadion Kagawa, wearing his new number seven shirt, managed to score in a 3-1 victory over Freiburg.