Chelsea manager Antonio Conte says new signings David Luiz and Marcos Alonso will start Sunday's game against Swansea City on the bench.
The two defenders "need a bit of time" to properly understand what their role will be in the Italian's squad.
The Blues face Francesco Guidolin's side hoping to keep their 100% record intact.
"Today we had the first training [this week] with all the players, because Willian arrived after training yesterday, but he had the possibility to have the same training with the assistant coach," Conte told reporters.
"I am happy because I saw all the players with good fitness. The players that remained in Cobham worked very hard, and the players that came back are fit.
"I think the new players [David Luiz and Marcos Alonso] need a bit of time to work with a new method, a new philosophy, a new idea of football and it's important to give them a bit of time.
"For this reason their chance of playing from the start is not high."