Chelsea boss Jose Mourinho says he has four options to replace injured defender Branislav Ivanovic.
The 31-year-old suffered a hamstring injury while on international duty with Serbia and will be out until the end of the month.
And the Portuguese revealed that midfielder Ramires could be deployed in a more defensive role with young Ola Aina also an option.
"We have only Ivanovic's injury, and Courtois recovering, everybody else is available," Mourinho told reporters.
"I have four solutions: I have Azpilicueta, I have the adaptation of Zouma or Ramires and I have Ola Aina, an 18-year-old who has never played a Premier League game but he's a boy with lots of potential. He's also an option.
"It depends on matches, opponents, the moment, but we have solutions.
"Ruben [Loftus-Cheek] has been with us since January, working with us every day, having the opportunity to play some matches, having an evolution physically, mentally, tactically. I think he's going to be a really top player. He's ready."