Ferguson confirmed the news at his press conference on Friday morning.
"Kagawa is out for three to four weeks with a knee injury. Playing on Tuesday (against Braga in the Champions League) didn't help. It is disappointing," the Scot said of the Japanese midfielder.
On a positive note, Ferguson reported that defender Chris Smalling was back in training following a broken metatarsal.
"That is a big bonus for us," Ferguson added.
"Phil Jones should start (training) a week on Monday as well."
Jones suffered a knee injury in training last month.
Borussia Dortmund hears Wembley Calling and are headed to London for the Champions League final.
The Juventus jersey for the 2013/14 was released earlier this week. Be the first to wear the colors of the Old Lady.
The adidas Nitrocharge is the most talked about new cleat in years. It was released on May 15 and will take your pitch by storm.
Chelsea won the Europa League on Wednesday. The Blues defeated Benfica 2-1 on injury time goal from Ivanovic.
Bayern Munich are kings of Germany and hope to be crowned kings of Europe at Wembley later this month!
adidas has added some color to the Predator line with this new colorway. Released on May 17. Be the first to own a pair.
The new PUMA evoSPEED 1.2 FG. A great new soccer cleat with classic look and first time for PUMA to be on the cleat.
Ajax has released their away soccer jersey for the 2013/14 season. Get in the Gear.
The push for more color on their cleats, adidas has added the infrared colorway to the adiZero f50 Line.
The Liverpool 2013/14 soccer jersey is available for pre-order. The Reds are eager to compete for silver next season.