Rangers signed the American defender from France's Saint-Etienne last August, but the 140-year-old club has tax debts of $32.7 million and entered bankruptcy protection in February.
The team's assets were purchased by a new company last month, but it was refused admission to the Scottish Premier League.
Rangers could be placed in the second, third or fourth tier, and Kyle Lafferty, Steven Naismith, Steven Whittaker and Allan McGregor are among the players who already have departed.
“A lot of the fans now are starting to turn on the players because that's all they have left to get angry at,” Bocanegra said Sunday.