Hundreds of fans were waiting at the airport in Shanghai to greet the Reds after a long flight from South Africa on Sunday night.
Screams and renditions of 'Glory, Glory Man United' echoed around the arrivals hall as the players entered and became even louder when they stopped to sign autographs and pose for photos.
The team bus then headed to a nearby sports complex where the squad took part in a light training session in hot and humid conditions.
Sir Alex's men are in Shanghai for the next four days to continue pre-season preparations, with a friendly match against Shanghai Shenhua to come on Wednesday night.
Click on the image above to view our gallery of arrival and training photos.