Everton boss David Moyes is unsure if he will buy a new defender this month.
Moyes could be in the market for replacement after selling Lucas Neill to Galatasaray.
"I wouldn't be optimistic about replacing anybody because I think it's a difficult market," Moyes said. "I certainly won't talk about players at other clubs because that's not the right thing to do, but I wouldn't be confident that we would be able to get a replacement in.
"It could leave us a gap, certainly in the short term. Joseph Yobo could be back in a couple of weeks time and Phil Jagielka's not too far away on the horizon, but maybe in the short term it may leave me short.
"But over the piece, I think if I get over the next couple of weeks then I think I would be okay."