According to reports, he was on the sideline, testing mobility, and was trying to get back into the game.
Even if he could have come back in, I'd rather save him for the playoffs, especially given how good Aneyas Williams has looked as a true freshman.
Link: https://www.on3.com/teams/notre-dame-fighting-irish/news/notre-dame-fighting-irish-football-jeremiyah-love-injury-update-usc/