Manchester United midfielder Shinji Kagawa believes that his days in a red shirt will be numbered unless he can improve his level of performance.
The 24-year-old featured in his first Premier League match of the season under new boss David Moyes on Saturday, but he was replaced at half-time after having little effect on proceedings.
The Red Devils went on to lose the match 2-1 courtesy of a winner from West Brom's Saido Berahino, and Moyes has now led his new side to their worst start to a league season in 24 years.
Kagawa featured 20 times for United under Alex Ferguson last year, and his tally of six goals was ample payback for the £12 million shelved out to take him from Borussia Dortmund that summer.
But he has been left on the fringes by the incoming former Everton manager Moyes, and the Japanese international accepts he faces a battle to stay with the club.
He said: "I have to take this like some kind of message.
"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."
The game was still without a goal at Old Trafford when Moyes hauled his midfielder off the pitch to be replaced by the virtually untested 18 year-old Adnan Januzaj.
He has now been substituted in all three games he has started this season, after Bayer Leverkusen in the Champions League and Liverpool in the League Cup.
And Kagawa confessed that he felt he could of had more of an influence in the second half of the encounter with West Brom, had he remained on the pitch.
He said: "I thought that I would have been able to find some space to create the chances in the second half, so in that sense I was disappointed.
"Sure, I wasn't involved that much. I didn't touch the ball enough, but I was trying to be patient."
The number 26, who has 49 caps for the Japan national side, may get his chance to impress in the Champions League against Shakhtar Donetsk this evening.
This is before United return to Premier League action against bottom of the league Sunderland at the Stadium of Light on Saturday.
They will be bidding to make the climb from a miserable 12th in the league table.
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