The England midfielder sustained the blow during the loss to Manchester United, but came off the substitutes' bench at Carrow Road to net the decisive strike in the Reds' 5-4 win.
Lallana was grateful to make the intervention, rather than remain on Merseyside in anticipation of Tuesday's Capital One Cup semi-final second leg with Stoke
Liverpool hold a 1-0 lead from the first leg.
"I had a bit of a knock after the United game," he told liverpoolfc.com.
"Not just credit to the manager, but credit to the medical team as well.
"They could easily have said to stay at Melwood and recover for Tuesday, especially with the amount of injuries we've got at the minute.
"Sometimes in football the risks pay off; plenty don't, but plenty do. I think that risk possibly won us the game."
Source: PA