Can I sue a restaurant if I fell on a wet floor?

I was walking back to my seat in restaurant after going to ladies room. Before I realized it, I felt myself falling. I tried to stop, but couldn't ...the floor was wet. Before going to ladies room an employee told me he was going to be moping. By the time I came back fr ladies room I forgot all about the floor. When I fell, I remember seeing a yellow warning sign off to the side, but don't remember seeing it blocking the floor. The employee was not there to ensure the floor dried before leaving.Went to Urgent Care a few days . My leg was badly bruised and I was in pain. I was diagnosed with a contusion and was told to come back after 4 weeks if I still was hurting. I waited 5 weeks and went back for more xrays. There are no broken bones, but Dr advised me to get an MRI because he believes I have tissue damage and fluid in my leg. I am still hurting ...cannot put pressure on my knee without it hurting. I am trying to get to a Dr appt. but can I sue the restaurant for leaving floor wet