Knockaert was substituted after just 20 minutes of the Foxes' 4-0 win over Bristol City on Saturday. The French winger came off worse following a challenge with Liam Kelly but he is expected to recover quickly.
"Anthony got a knock in training on Thursday and took one in the same place," said Pearson following the game at Ashton Gate.
"He wasn't well in the morning and it was touch and go whether he was going to play. I think he'll be okay, but it was a pretty easy decision to make the change.
"We coped pretty well with Anthony going off early on, as Lloyd (Dyer) came on and did a good job for us on the right."