"I'm not too sure what damage I've done yet but I'll have an X-ray and know more tomorrow.
"It'll be disappointing if its a broken metatarsal but I'll try to remain positive."
Two headed goals from Mikael Silvestre were enough to give United the three points, but Gerrard insists the Reds will bounce back.
"When you go away from Old Trafford with nothing it's always disappointing," he added. "I'm a bit disappointed with our first half performance but we did better in the second half.
"But to concede two goals from set pieces is disappointing because we've been working on it.
"It's a long race. We'll try to bounce back on Saturday against Norwich and take it from there."