Carney Chukwuemeka undergoes surgery after suffering knee injury
Chukwuemeka scored the equaliser before being forced off during half-time at the London Stadium, where Chelsea suffered a 3-1 defeat against West Ham.
"Carney underwent surgery and will now begin his recovery," Chelsea said in a statement.
"The 19-year-old will work with the club's medical department on his rehabilitation at Cobham (Chelsea's training ground)."
Chelsea signed the England youth international from Aston Villa on a six-year contract earlier this month.
"From Joy to Pain within minutes... My first goal for Chelsea. A moment I've prayed so hard for and dreamt of since I was a kid...," Chukwuemeka said on Instagram.
"Minor setback but I will be back stronger than ever. Thank you Chelsea fans for your love and support. See you soon."