Sunderland must find ways to break teams down and take advantage of the numerous chances they are creating in the Championship or risk it becoming a "problem", says boss Tony Mowbray.
Saturday's setback at Plymouth saw 24 shots created for no reward, as the Black Cats lost 2-0 at Home Park.
Wednesday's 2-1 home loss to Huddersfield yielded 27 shots on goal.
"We had to show huge creativity and guile, but that sadly lacked a bit," Mowbray told BBC Radio Newcastle.
"We have to find an answer because if we don't the goals for column will become a problem.