Rafael Benitez's side will also have to battle jet lag after their return flight from Yokohama was delayed, while Neil Warnock's Leeds have won four of their last five and can take heart from West Yorkshire neighbours Bradford, who shocked Arsenal last week.
"They're going through a bit of a sticky patch at present but they've still got world-class players and with those and the manager it's going to be very tough for us no matter what situation they're in," Peltier said.
"We're going to have to play really well that's for sure. The way we play when we put pressure on teams, we keep going at them and it's relentless. If we start off like that, we can get them on the back foot and that will give us a big chance.
"There's a lot of pressure on Chelsea and they will be expected to beat us but we won't go out there without fighting and if we put on a good performance there's a good chance that we can get a result.
"They're one of the top teams in the world with some of the best players in the world. It's going to be a bigger scalp if we beat a team like them."
And Peltier also has a lot of respect for their interim manager Rafael Benitez who handed him his Liverpool debut in a league cup tie against Reading in 2006.
"I was at Liverpool for 10 years and he was there for three or four of those years," he said.
"I worked under him for quite a bit and he gave me my Liverpool debut so I've got a lot of respect for him. He's one of the top managers out there and his CV shows he's won a lot of cups and he has great experience."