Jets coach Rex Ryan was hopeful after the game that the injury was not severe.
"He's not a guy that comes out very often," Ryan said. "So obviously, that would be a killer blow if he's not able to go."
In the first five weeks of the season, Harris has recorded 39 tackles, one sack and forced one fumble. In his eight years in the league, all with the Jets, he has 525 tackles, 25.5 sacks, six interceptions and one touchdown.
The New York Post's Brian Costello reported that an MRI performed on Monday revealed no structural damage. Harris remains day-to-day, Costello added.
The Jets are 1-4 and currently in last place in the AFC East. They host the Denver Broncos at home on Oct. 12.