It has been a tough first season in England for Kagawa.
Instead of preparing for a Champions League semi-final with Borussia Dortmund, Kagawa is hoping his excellent performance at West Ham on Wednesday earns him a place in United's starting line-up for Monday's Premier League encounter with Aston Villa at Old Trafford.
Kagawa's display at Upton Park was his best since the early days of his United career.
But his form dipped after he suffered a knee injury in October that kept the 24-year-old out for two months and only now is it returning.
"He's doing very well for us now," said Ferguson.
"He has fantastic composure on the ball and his decision-making is good.
"He seems to always pick the more sensible pass and for the first goal on Wednesday he had the composure to take the player on in a tight area and roll the ball to Antonio Valencia for a tap-in."
Kagawa's presence is one of the reasons why Wayne Rooney's future is such a hot topic.
Robin van Persie's contribution for United this term, underlined by his nomination for the PFA Player of the Year award, has proved the wisdom of his summer arrival.
In addition, Javier Hernandez and Danny Welbeck, provide other forward options, whilst there have been continuing links to Robert Lewandowski and Radamel Falcao.
With Rooney starting in midfield at Stoke last weekend, there was a ring of truth about the statement of a leading commentator in France, who claimed the 27-year-old's move to PSG was "a done deal".
Previously, Ferguson has insisted Rooney would still be at Old Trafford next season.
He certainly doesn't expect him to be in France.
"I don't think there is anything in that at all," he said.
Not that Ferguson could shed any light on when proposed talks over a new contract, which are due to open this summer, are likely to begin.
"I couldn't tell you about that," he said.
Former Villa winger Ashley Young definitely will not be involved after he was ruled out for the remainder of the campaign by an ankle injury.
Ferguson regards himself as fortunate not to have picked up any more knocks during the bruising midweek draw at Upton Park, when Andy Carroll put himself about like a human battering ram.
"It was like the old days," said Ferguson, who remains convinced Carroll should have been sent off for his first-half challenge on David de Gea.
"It was a red card - there is no dispute.
"Sam has masked it by talking about being robbed but the fact is they should have had 10 men.
"I'm just happy that coming out of that warzone, although Nemanja Vidic had got a beautiful bruise on his cheekbone, no-one was seriously injured."