Interim Chelsea manager Guus Hiddink confirmed on Wednesday (AEST) that Pedro broke his nose in a fall, though the Spain international has not been ruled out of the trip to Anfield.
Hiddink said he was unsure what exactly happened at Pedro's home.
"Pedro is not out but has broken his nose - not at training but at home. He trained," Hiddink said. "I don't know what happened. He had a little accident on his own.
"His wife was not involved, she was there and I asked her. He very unfortunately fell and broke his nose."
Chelsea is ninth in the Premier League, 10 points adrift of eighth-placed Liverpool heading into the penultimate fixture.