Chelsea boss Antonio Conte is eager to bring in more signings.
Conte was speaking after a 3-2 victory over Bristol Rovers at Stamford Bridge that booked Chelsea's passage into the third round of the EFL Cup.
Ola Aina limped off in the second half and was replaced by Terry and Conte, who is hoping to sign another defender before the transfer window closes, is concerned that his resources could be stretched ahead of Saturday's clash with Burnley.
"I hope the injury to Aina is not serious because if it is we will only have four defenders for Burnley. I'm a bit worried," Conte said.
"I'd rather speak with the club about transfers and we stay in contact every day. We are trying to find the right solution to improve this team. It's right to pay the player in the right way."