Ferdinand excited to meet new Man Utd teammate Kagawa
The defender will begin training with his new colleague in the coming days and he is backing him to achieve big things at Old Trafford.
"I can't wait to see Kagawa in action," Rio told MUTV at Nike's 'The Chance' event. "I watched him on TV last season and saw him in the cup final when Dortmund beat Bayern Munich and he looked very impressive.
"I think a lot of people will be surprised by how good he really is and hopefully he can hit the ground running."