Robson, who did so much to help make it the most famous number at Old Trafford, has also praised the Japan international's adaptability and thinks he has the attitude required to succeed under Sir Alex Ferguson.
Kagawa said on sealing his move from Borussia Dortmund: "Since I am very new to the club, I have no intention to get a 'big' number" and indicated he would opt for a number of personal significance rather than the one vacated by Michael Owen. It was announced on Tuesday that the new recruit will wear No26 with Antonio Valencia taking on the seven shirt.
"Straight away that makes him seem like a good, honest lad," Robson told ManUtd.com. "For him to say that rather than put the No7 shirt on, proves he must be a down-to-earth lad. One thing you get with Japanese boys is they’re very hard working and conscientious about the job."
There is already great debate over where Kagawa will fit into the United line-up as he is capable of playing in an advanced role just behind a lone striker. It will be interesting to see where he features during the pre-season tour this month.
"I think the boss will be looking at where he does play him out there [on tour]," added Robson. "He’s got a good option now and can play Javier Hernandez and Danny Welbeck up top but can also now play Wayne [Rooney] up there if he really wants to and Shinji can play in behind him.
"From what I’ve seen and been told about him, he can play in numerous positions and won’t let you down. He can do a good, hard, workmanlike job for you.