Manchester United midfielder Shinji Kagawa admits his performances have not been up to scratch during a difficult first season at Old Trafford.
The 24-year-old arrived in Manchester last summer but did not live up to the reputation he built whilst playing in Germany for Borussia Dortmund.
|28/1||Man Utd are 28/1 with BetVictor to win the Premier League and Champions League double next season
And having been bought by former United manager Sir Alex Ferguson, Kagawa now has to impress new boss David Moyes.
"It was a tough time for me with a lot going on in my head," Kagawa told the Premier League's official website.
"I am not happy with my performance for the team at all. I didn't score that much and I also had my (knee) injury.
"Despite that, it was great we won the league, I just don't feel that I achieved everything that I wanted."
"For me personally, it wasn't a good season."
Kagawa made 26 appearances for United last season, scoring six times.