Farbrace said it is “pretty obvious that this group of players have only got a few months left together”.
“Come the end of season, there will be a chunk of players leaving, and that’s not their fault, it’s not their decision and for some of them, it will be heartbreaking,” he said.
In what Farbrace described as a “pivotal week for the club”, the 58-year-old has praised the players for their attitude throughout the ongoing uncertainty.
“The lads have been brilliant up to now,” he said. “They’ve not let the disappointment and the anger of what’s going on at the club get in the way.
“But it is going to be a tricky next couple of weeks.”
Sussex still face the prospect of another £1m shortfall this season and have to make cuts from their playing budget to reduce costs.
Any contract offers they make to players have to be overseen by the ECB.
Farbrace said it is his job to try and keep contract distractions away from the dressing room.
“But I’ll be perfectly honest,” he reiterated. “I’m not looking forward to the next couple of weeks in terms of the off-field stuff.”