The July 23 co-main event bout between light heavyweight contenders Anthony Johnson and Glover Teixeira has been postponed, as Johnson has been forced to withdraw in order to tend to a serious family matter.

The UFC will look to rebook the bout in the near future.

The UFC on FOX event at Chicago's United Center, headlined by the matchup between Holly Holm and Valentina Shevchenko, will proceed as scheduled.

Moving into the co-main event slot is the lightweight showdown between Gilbert Melendez and Edson Barboza, and the rest of the FOX main card will see a meeting of heavyweights Bojan Mihajlovic and Francis Ngannou, and a strawweight battle pitting Kailin Curran against Felice Herrig.