Rafael Benitez has said the arrival of Demba Ba will help make Chelsea striker Fernando Torres a better player.
Difficult
Torres could return to the Chelsea line up for the Capital One Cup semi-final against Swansea on Wednesday, with Petr Cech, John Terry, John Obi Mikel and Victor Moses all remaining on the sidelines.
The Stamford Bridge tie kicks off a busy period for Benitez's men, with eight games in 25 days to contend with.
"When you are a top side you know you have to play twice a week, but because of Japan and the time we had to go there, we have been playing a lot of games," Benitez said.
"It's difficult for us to plan and prepare training sessions. Monday's was another light session and you can't do everything you want to do.
"We have to try to do tactical adjustments in every session, so it's quite complicated, but in a top side it has to be like this."
Legends
And Benitez has also warned fans of changes to the squad, refusing to rule out the possibility that popular players could leave the club.
"I think it's always easy to talk about the legends, and you have to have a lot of respect for them because what they've achieved for this club has been fantastic," Benitez added.
"But you have to have new players - it could be English or foreign, it doesn't matter - and carry on winning games.
"That's what the fans are expecting. Everyone knows the legends have been here and what they have achieved, but you have to see new players coming. It's part of life.
"You have good memories and you respect people who achieve something for a club. That's very positive.
"But, at the same time, you have to think about the future. You cannot be waiting.
"You have to move forward, bring in new players and at the same time try and bring the best out of those you have. You have to use their experience, too."
