Sir Alex Ferguson watched Dortmund’s 5-2 German Cup final victory over Bayern Munich in Berlin on Saturday with Mike Phelan to scout Shinji Kagawa.
Kagawa, who has a year remaining on his current deal, was in Manchester this week to negotiate a deal with United.
“It was good that I was able to meet him in person and talk,” said Kagawa. “I want to think hard before making my decision. I want to choose a team where I can take on challenges.”