Chelsea boss Frank Lampard is counting on Toni Rudiger's return from injury soon.
The defender is working towards a return from groin surgery.
Lampard said, "He's getting closer, he had a really good week's work. The reality is he's not played for a very long time so it's a mini pre-season. Now the injury hopefully is over, we need to get him properly fit.
"He's working very hard. It's days and weeks rather than months which is great news for us."
Lampard, meanwhile, insists he's happy with his defence, despite the goals they're conceding.
"I didn't like the last 20 minutes against Valencia, but that can happen. If you're trying to play in a certain way like we are, there will be games when you'll be tested. I have seen a lot of big teams in the Champions League concede goals this season, not just ourselves.
"We're conceding more goals than we want, but in terms of what we're conceding, crosses into our box and teams getting in to our box, it's not that bad. Our conversion rate isn't good."