Combate.com was first to report the news. The promotion has not made an announcement regarding the injury, but according to ESPN, the plan is to rebook the bout at a later date.
UFC 227 takes place at Staples Center in Los Angeles on Aug. 4 and is headlined by a bantamweight title rematch between T.J. Dillashaw and Cody Garbrandt.
Brunson had a two-fight winning streak snapped in his most recent outing, when he suffered a first-round knockout lost to Ronaldo Souza at UFC on Fox 27 on Jan. 27. Carlos Jr. has won his last five, including a first-round submission of Tim Boetsch at UFC on Fox 29.