Sir Alex Ferguson believes Manchester United will see the best of Shinji Kagawa in his second season at Old Trafford.
The United manager said the physicality of the English game had been a culture shock for the Japan international, a summer signing from Borussia Dortmund.
Kagawa, the current Asian International Footballer of the Year, scored 17 goals last season to help Borussia win their second successive Bundesliga title, but has struck only twice in an injury-hit first campaign for United.
"He's come from an environment that is completely different," Ferguson said. "I think the difference between German football and English football has been shown.
"In Germany, you can't foul. It's foul after foul. The Premier League is completely different - there's physical contact in our game and it's different to Germany but, next year, he'll be better."
Kagawa, who cost United £13 million, was a surprise selection for the Champions League game at Real Madrid and, while the midfielder failed to make a major impact in the 1-1 draw at the Bernabeu, Ferguson said he was pleased with some of the things he had seen.
He added: "In the first half an hour, he was terrific - he kept making these great runs through them, which we thought were going to be one of our biggest assets in the game.
"He was just unlucky that he had a couple of heavy touches on the ball when he made runs past Robin van Persie.
"He kept opening them up, but people don't see that, which is a wee bit unfair as he did really well for us."