Signing a central defender is top priority for Manchester United, and so is finding a new home for Anthony Martial. Sule was full of confidence on the back of his World Cup involvement, dealing ably with rare moments of danger and exuding belief in stepping out of defence.
The France international's future has been a source of relentless speculation over the past few months following a hard second season under Jose Mourinho.
Bayern spent most of the game in United's half, and Mourinho has again expressed his concern about the quality of his squad.
United kick off the Premier League season against Leicester on Friday while Bayern start their Bundesliga campaign against Hoffenheim two weeks later, after facing Eintracht Frankfurt in the German Super Cup next Sunday. At the other end Manuel Neuer could have happily watched from a deckchair.More news: Prince Harry Sells His Audi RS6 Avant
The Frenchman has returned to training with the Red Devils after leaving them for the birth of his child.
The returning Marcus Rashford played 65 minutes and Fred impressed in midfield but Jose Mourinho will be sweating over the fitness of Eric Bailly, who hobbled off in the second half.
The deadlock was eventually broken after 59 minutes as Javi Martinez rose above his marker to head from a corner to put Bayern ahead.
It said everything about United's display that they did not even manage a shot on target.
In the absence of many first-team regulars, Mourinho's men sat deep in a passive performance, which was a departure from the earlier scenes at Wembley Stadium, where Manchester City and Chelsea both employed high presses to varying degrees of success in the Community Shield.