UFC 168 adds Michael Johnson vs. Gleison Tibau lightweight bout for Dec. 28 in Las Vegas

Ultimate Fighting Championship (UFC) is stacking its year-end pay-per-view (PPV) extravaganza as UFC 168: "Weidman vs. Silva 2" continues to take form with the addition of a strong lightweight contest between two venerable combatants.

Michael Johnson vs. Gleison Tibau is set to go down on Dec. 28, 2013 at the MGM Grand Garden Arena in Las Vegas, Nevada, likely as one of the Facebook or FOX Sports 1 "Prelims" offerings.

UFC officials announced the new fight via Twitter on Wednesday evening.

Tibau has won back-to-back fights and three of his last four. Less than three weeks ago, he took a split decision from Jamie Varner at UFC 164 in Milwaukee. Back in May, he choked out (and retired) John Cholish with a second-round guillotine at UFC on FX 8 in his homeland of Brazil.

That "W" got him back on track after a split-decision loss to Evan Dunham at UFC 156.

A member of the Blackzilians, Johnson got back into the win column last August with a unanimous decision win over hometown hero Joe Lauzon (who just found out his next fight, too) at the UFC Fight Night 26 event on FOX Sports 1 in Boston.

The victory (which featured a rare 30-25 scorecard) snapped a two-fight losing skid that saw him drop a decision to Myles Jury at UFC 155 before getting choked out by Reza Madadi in Sweden at UFC on FUEL TV 9. The Ultimate Fighter (TUF) 12 runner-up will be fighting in UFC for the tenth time and is 0-2 in his two career fights in "Sin City."

UFC 168: "Weidman vs. Silva 2" will be headlined by the biggest middleweight title fight in history, as newly-crowned champion Chris Weidman tries to go two-up on former 185-pound kingpin Anderson Silva. The co-main event will feature UFC Women's Bantamweight Champion Ronda Rousey in a second go-round with former Strikeforce nemesis and fellow TUF 17 coach Miesha Tate.

All that doesn't even include the addition of Travis Browne vs. Josh Barnett in the heavyweight division.

For more news and notes on UFC 168 be sure to check out our complete event archive right here. To check out the latest "Weidman vs. Silva 2" fight card and rumors click here.