Chelsea interim manager Guus Hiddink says captain John Terry will miss today's Champions League game at Paris Saint-Germain.
The 35-year-old limped out during the weekend win against Newcastle United.
He will continue to be assessed ahead of Sunday's home game against Manchester City.
"He [John Terry] was having too much trouble to travel," Hiddink said.
"We made a test this morning and it didn't work out well, so the decision was made to leave him at home. He was, himself, also convinced he could not be of worth to the team at the moment.
"He has a bit of a problem on his hamstring and on the tendon in that area. That's why we had the test this morning and we decided he would not participate.
"It will be difficult to say whether he can play this weekend. That's why we'd prefer him to keep undergoing treatment back at Cobham.
"We've practised with other people in at central defence, so it was not a surprise for the players that we had to make some changes. Of course, not having John is a bit of a setback.
"He's a leader. But I'm not the type of coach to moan and moan. We have to go on. The players who will replace him I have complete faith in them."
Attacking midfielder Oscar is in the squad to face Laurent Blanc's men with Eden Hazard also expected to be in the starting line-up.
"[Oscar had] a good training session this morning and will be available," Hiddink continued.
"I think he [Eden Hazard] had a difficult period when he had some injuries, we started to bring him back and his first game at Crystal Palace he got another injury.
"If a player gets a setback twice, it's difficult to come back. But now, in recent weeks, he's trained very well. He came on for 10 minutes and 20 minutes, and played the last match in full. He needs rhyhm of the games, but I'm sure he'll be of great value for us."