by a nasty studs-up challenge by Shouting Wang.
Thankfully the 18-year-old was able to continue, although there was more disappointment for Powell on 23 minutes when he dragged the ball wide after he'd sprung the offside trap and latched onto a clever lofted pass by Davide Petrucci.
It was the only clear-cut chance United fashioned in a first half that almost ended disastrously when Lindegaard was forced into a fine save to deny Griffiths just before the break.
It's perhaps unrealistic to expect too much from a squad cobbled together from those first-team and Reserves players not resting from major tournaments, competing in the Olympics or currently injured. And pre-season, remember, is predominantly about gaining match fitness.
Nevertheless, Sir Alex will have been disappointed by the lack of entertainment and cutting-edge play in the final third. Only Petrucci and Kagawa provided any occasional sparks in the opening 45 minutes.
The young Italian didn't re-emerge after the interval, though. He was one of three players (Powell and Lindegaard the others) who made way for Bebe, Ryan Tunnicliffe and goakeeper Sam Johnstone.
Kagawa then saw a shot blocked, Anderson rifled a shot just wide and Shouting Wang's effort looped just over the bar at the other end as the second period began more positively.
Macheda forced a smart save from Shanghai goalkeeper Qui just before the hour mark after a surging run and slide-rule pass from Shinji Kagawa sliced open the Shenhua defence.