Gerrard was forced to limp off midway through the second half after appearing to feel his hamstring and was replaced by Lucas Leiva.
Liverpool boss Brendan Rodgers has confirmed Gerrard will be assessed this week to see how serious the injury is.
"It was his hamstring so we just need to see how it is," said Rodgers. "He was outstanding in his performance, the quality of his passing, but when he went to get that pass he felt a little tweak.
"We just need to assess that in the next day or so. It was definitely his hamstring. Hopefully it's just a strain and we'll see where we're at in the next 48 hours."
Rodgers also revealed that Daniel Agger missed the game against West Ham through illness, but he was happy with his replacement Mamadou Sakho after the Frenchman scored his first goal for the club in the 4-1 victory at Anfield.
"Daniel felt sick this morning when we arrived at the training ground," added Rodgers. "But a more than capable replacement came in, who I thought was excellent.
"I thought Sakho looked strong and aggressive and he looked like he really wanted to take his opportunity. He did that. I thought he and Skrtel were both excellent."