Brighton defender Dan Burn has suffered a fractured clavicle that will keep him out for six to eight weeks, according to Albion boss Graham Potter.
Burn was replaced by Bernardo just 22 minutes Brighton's 1-1 draw with Chelsea at the AMEX Stadium following a challenge by full-back Reece James.
Former Fulham and Wigan defender Burn has played in all of Brighton's 21 games so far this season.
When asked in his post-match news conference what he made of the challenge from James that led to the injury, Potter said: "I don't think there was anything sinister to it, it just looked like a really heavy contact.
"These things happen in football."
The Seagulls came from behind to draw with Frank Lampard's side thanks to an overhead kick from Iran international Alireza Jahanbakhsh.