The defender was carried from the pitch at Fenway Park following a rash challenge from Joris Gnagnon, which resulted in a red card for the opposition player.
Larouci has suffered heavy bruising in his femur bone and the club’s medical team will continue to monitor the injury as it settles.
However, the Reds are optimistic the 18-year-old will only be ruled out for no more than a matter of weeks.