The club unveiled their two new signings as they look to begin their pre-season preparations ahead of the coming campaign, and Ferguson remained keen to state how closely both players had been followed before the club decided to make a move for them.
"First of all they're young and we've been scouting them both for quite a while now," Ferguson told reporters.
“Shinji obviously has a higher profile than Nick, because [Borussia] Dortmund have had such a fantastic time in the last two years and he came to prominence through that.
“Our scout in Germany was talking about him for a quite while, so we scouted him and decided he was the right type of player we needed at the club."
"If his goalscoring record continues he could be a very good player for us"
The 23-year-old Japanese international midfielder enjoyed a successful two-year stay at Borussia Dortmund, winning the league title in both seasons at the club, and Ferguson remains excited by what the player promises.
He added: "Shinji plays in behind the striker. He's very quick, has a good vision of the game and his goalscoring record over the last two or three years is very good for that position.
"It was good that he was with a successful team to help him adapt to European football.
"Now he is at that stage where he is a maturing player and over the next few years we will see that at United. It's a good time for him to come to us.
"We shouldn't be looking at one player changing the way we play, but he could make a difference.
"He can give us that bit extra in the final third of the field. If his goalscoring record continues he could be a very good player for us."
Ferguson was also quick to dismiss any suggestion that Kagawa may struggle to adapt to his new surroundings in England, stating that his new charge should have no trouble learning the language.
"He's going on tour to South Africa and China with us next week and that will give him an opportunity to get to know the other players and acclimatise to the way we are," he added.
"There's also the issue of the language and I'm sure over the next few months he'll improve his English – or Scottish – whichever he finds easier.
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"But he won't understand my Scottish when I lose my temper anyway so it doesn't matter! But there is a progress and procedure there which he has to adapt to in terms of the language.
"Having said that, I think he'll find English will be easier than German, which he speaks a little."
Alongside Kagawa, the club also presented 18 year-old former Crewe prodigy Nick Powell, who had a breakthrough year in League Two, finishing the league campaign with 14 goals, including a sensational volley in the play-off final.
Ferguson stated that the club had tracked Powell for some time, but decided to move for him shortly before the end of last season, stating that he sees his future in a more reserved midfield role.
"We were watching Nick from when he first came into the Crewe team last November and did very well," Ferguson added. "It got towards the tail-end of the season and we got more serious about him.
"We scouted him a few times and decided to do a deal before the play-offs, which proved the right thing to do.
"He's only 18, he is young, and although Crewe played him as a forward or in between the striker, we see him as a centre-midfield player and hopefully we see that progress."