Manchester United playmaker Shinji Kagawa has admitted that he must improve in order to "survive" at Old Trafford.
The 24-year-old, who left Borussia Dortmund to sign for the Red Devils in June 2012, has played a peripheral role with the England giants since his £17m transfer.
The Japan international started in Saturday's 2-1 defeat to West Brom, but United boss David Moyes substituted him at half-time following a disappointing opening 45 minutes.
“I have to take this like some kind of message [from the manager],” Kagawa told Japanese newspaper The Hochi Simbun. “I need to improve more and more, or I cannot survive at this club. I have to take this in a positive way and keep trying to do my best.
“I wasn’t involved that much [against West Brom] and I didn’t touch the ball enough but I was trying to be patient, so I didn’t feel that bad at half-time. I thought I would have been able to find some space to create the chances in the second half, so in that sense I was disappointed to have been substituted.”
Before his move to England, Kagawa earned rave reviews for his performances in the Bundesliga, where he helped Dortmund win back-to-back league titles in 2011 and 2012.
However, at Old Trafford he has rarely had the chance to play in his favoured role behind the striker, often being deployed on the left-wing.
Kagawa scored six goals in 26 appearances for United in his debut season with the Premier League champions, three of which came in a 4-0 defeat against Norwich City in March 2013.