Manchester United returned to Old Trafford for the first time this summer after a whirlwind tour of the US to take on last season's Ligue 1 runners-up Lens.
But a poor first-half display threatened to make United's homecoming anything but triumphant. Mason Mount scuppered an opportunity to open his United account despite finding himself inside the six-yard box with an open goal.
Meanwhile, Andre Onana's teething problems as the club's new No 1 continued as the summer signing was caught off his line early in the first-half allowing Florian Sotoca to put the visitors in front.