This is apparently the new leaked Man Utd jersey for the 2019/20 season. The kit was apparently put on sale by a retailer ahead of schedule, and fans online were quick to snap up photos before it went down. Appears to be the real deal, and pays homage to the treble winning side of 1999 (the lettering at the bottom)
The current season appears to be trophyless one for Ole Gunnar Solskjaer’s men, and we may not even see them in the Champions League next season, with a Europa League finish looking most likely for them