Pedro replaces the injured Eden Hazard in Guus Hiddink's only change for Chelsea's Premier League match tonight from their last league game against Crystal Palace on 3 January.
Hazard is out with a groin injury.
Chelsea are yet lose under Hiddink, with three wins and two draws in his five games since replacing Jose Mourinho last month.
Before the game, Hiddink said is team could still finish in fourth place this season.
"So long as we have the possibility to go to fourth place we will go for that," he said.
"It's not that we are without chances to go there (fourth) and then we bring in youngsters, no.
"I will not hesitate whenever possible to bring in youngsters as well. The youngsters must try to learn also to work under this pressure."
His opposite number, Tony Pulis said: "We're in for a tough game. Chelsea have some wonderful players and we'll have to be on it and at our best.
"That's the same with every top four or five club. If you go away and play against them you have to have at least 10 of your players playing to their maximum to get a result."
TEAMS
Chelsea: Courtois; Ivanovic, Zouma, Terry (c), Azpilicueta; Mikel, Fabregas; Willian, Oscar, Pedro; Diego Costa
WBA: Myhill; Olsson, Yacob, Evans, Morrison, Brunt, McClean, McAuley, Fletcher, Dawson, Rondon.
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