Terry: Chelsea squad not as strong
"We've missed some key players at key times and it is a case of keeping everyone fit now over the Christmas period, where we have two games in three days," he told the club's official website. "In the past, we had a big squad and could rotate and put other players in. We don't have that now."
Chelsea have arguably boasted the strongest squad in the country in recent years but a change of policy behind the scenes led to a summer cull of some of their experienced players in favour of more youngsters being blooded.
The effect of that was not apparent initially as the champions began the season at a canter but they have won only one of their last seven league games to slump to fourth in the table.
Their key players are now back and captain Terry is adamant all the club's title rivals will slip up before the end of the season, but he believes it is vital Chelsea do not suffer any more injuries to their star names during the hectic festive period.
He added: "We have quite a young squad and it's a time for everyone to stay together like we always will.
"Once we've turned that corner, we can move on from there and wait for other teams to slip up, which they will do."
It is now exactly a month since Chelsea tasted victory in any competition, partly because Sunday's crunch clash with Manchester United was postponed due to the big freeze.
That means the Blues will have been out of action for 15 days by the time they take to the field again on Monday.
Related Chelsea News