Chael Sonnen-Wanderlei Silva Moved from UFC 173 to May 31 Event in Brazil

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The UFC 173 bill is now without a co-main event, as Ultimate Fighting Championship officials announced Thursday that Chael Sonnen’s light heavyweight clash with Wanderlei Silva has been pushed back by a week and will now headline a May 31 show in Brazil.

City and venue details for the event are expected to be announced shortly. No reason was given for the change.

UFC 173 takes place May 24 at the MGM Grand Garden Arena in Las Vegas and is headlined by a middleweight title showdown pitting reigning champion Chris Weidman against ex-light heavyweight ruler Vitor Belfort.

Sonnen and Silva are currently serving as coaches on the third season of “TUF: Brazil,” reportedly squaring off in an unsanctioned physical altercation outside the cage during taping. Sonnen, 36, last competed on Nov. 16, when he suffered a first-round technical knockout to Rashad Evans at UFC 167. Silva, meanwhile, has not competed since last March, when he knocked out Brian Stann in a “Fight of the Year” nominee at UFC on Fuel TV 8.