Cesar Azpilicueta’s first ever goal for the Stamford Bridge outfit restored the two-goal margin after typically dogged work from Costa.
West Brom pulled one back when Morrison scored with his second chance, volleying in after Salomon Rondon kept a cross in play.
However, despite West Brom’s efforts they could not find an equaliser and Chelsea held on to record their first win in what has been a hard start to the season.
Speaking after the game, Mourinho felt his side “deserved” the victory, insisting that others would be “disappointed” that the champions did not succumb to pressure from the home side.
James Morrison had an early penalty saved before Pedro opened his Chelsea account and set up Diego Costa for his side’s second of the game.
The Baggies replied on 35 minutes when McClean crossed towards Rondon who then spectacularly found Morrison inside the area and the midfielder coolly slotted past Courtois.
Against a physical West Brom, Pedro turned in a performance which had Chelsea fans in raptures with renditions of “Are you watching United?” after he made a seamless transition to the hustle and bustle of Premier League football.
“We have one point from two matches”, Mourinho told media.
Raheem Sterling – signed for 49 million pounds ($76 million) – has added an extra dimension to City’s attack and is providing a different problem for opposition defenses, which is allowing others like David Silva and Yaya Toure to shine. They don’t want to lose money.
Costa picked up possession in a unsafe position for Chelsea moments later but dragged his shot wide.
Any hopes Chelsea had of a comfortable win went out the window however when Terry was sent off nine minutes after half-time.
Chelsea boss Jose Mourinho was full of praise for new signings Pedro and Baba Rahman.
Reports suggested Branislav Ivanovic would also miss out but the Serbian retains his place at right-back, while Thibaut Courtois is restored to the starting line-up.
“I know from the national team he is a top player“.
Terry played every single minute of every league game last season and not many can believe the fact that he has possibly lost all his quality in a matter of months.
After drawing with Swansea and losing to Manchester City, this has been Chelsea’s worst start to a Premier League campaign for 17 years.
“I want to learn, I’m still young, I want to be one of the very best and I learn from the best”.