Wydad fell for the second time in a row in the tournament after the Juventus loss, meaning that they will not make it to the knockout stage.
Juventus were denied a clean sheet by Lorch, who collected a pass from Nordin Amrabat and clipped a good finish past Juventus keeper Michele Di Gregorio to score in the 25th minute.
Juventus and Manchester City top Group F with six points, with each enjoying the same goal difference margin.
Lorch's side is third, and Al Ain, also winless, is at the bottom.