Sutton admitted that Le Fondre, who has now scored 14 goals this season, was the difference between the two sides.
"Adam is playing with a lot of confidence and that's something that, it's fair to say, has been a problem for us all season," said Sutton.
"That's something that I will look to address in January without a shadow of a doubt.
"It is a problem, we are working hard in trying to create more chances. But it's about being clinical and making better decisions around the opposition's box."