A rep for Affleck calls the US Weekly story, which claims Affleck and the nanny, Christine Ouzounian, began dating after Ben and wife Jennifer Garner split but before they announced their divorce, "complete garbage and full of lies."
"The story is complete garbage and full of lies," Affleck's publicist Brooke Blumberg says.
"You shouldn't be able to hide behind 'blind sources.' We are considering legal options."
Us claims Affleck and Christine Ouzounian became close when she was hired as a nanny for Affleck and Garner's three children, Violet, Seraphina, and Samuel.
According to the magazine, Affleck and Garner were separated when Ouzounian was hired this spring.
The story is sourced to "multiple sources", none of whom are named. In fact, the only attributed quote comes in the form of a denial from Affleck's team.
Affleck's rep wouldn't go into detail about what specific legal actions they are considering, saying it's in the very early stages, as the story only went live Wednesday morning.