Thiago Silva, defender, 36, was made the captain of Chelsea on his debut but he made a blunder that resulted in a goal during the match.
Silva was directly responsible for the second goal Chelsea conceded, being easily dispossessed by Callum Robinson as West Brom raced to a 3-0 lead at half time.
Chelsea fought back to claim a draw, however, Thiago won’t look bad on this performance fondly.
The Brazilian addressed the error he made but thanked the club for their continued support.
He said: “I am upset, but I take responsibility for the mistake I made, as I always did.
“I want to thank my teammates and the entire staff for their continuous support since I joined Chelsea FC. I am really grateful of that support.”
Meanwhile, Frank Lampard has backed Thiago Silva to recover from a disastrous Premier League debut.
The 36-year-old, who joined Chelsea on a free transfer from PSG, was at fault for West Brom’s second goal in Saturday’s 3-3 draw.
Lampard said: “Thiago turns up here pretty fresh and he is in and around us, I am sure he will learn it quickly.
“I am not sure how relative it was on Saturday, but he does not speak the language very well.
“Some players in the squad do speak languages that he speaks, French being a main one, but we have lads here speaking Portuguese and Italian.
“If the language is a slight barrier, we need time to work. That is what we have in front of us.”