An unspecified injury has forced heavyweight Shane Del Rosario to withdraw from UFC 162. As a result, Gabriel Gonzaga has stepped in to fill the void and face Dave Herman at the July 6 event.

The UFC announced the changes late on Friday night.

Gonzaga will have about five weeks to prepare for Herman.

The fight is likely a pivotal one for the UFC career of Herman, who has lost three straight and is also coming off a suspension for a failed drug test that flagged him for marijuana usage.

Herman (21-5) has been finished in three straight fights. He was most recently submitted by Antonio Rodrigo Nogueira at UFC 153. Prior to that he suffered a knockout loss at the hands of Roy Nelson, and another TKO via Stefan Struve. His only UFC win was a Fight of the Night knockout over John Olav Einemo in June 2011.

Gonzaga (14-7) is seven weeks removed from a knockout loss to Travis Browne at The Ultimate Fighter 17 Finale, a defeat that snapped a three-fight win streak. He was just removed from a mandatory medical suspension on Wednesday.

UFC 162 takes place at the MGM Grand Garden Arena in Las Vegas, and will be headlined by a middleweight title match pitting Anderson Silva against challenger Chris Weidman.

The Ultimate Fighting Championship has fined middleweight titleholder Anderson Silva$50,000 for refusing to take part in a planned pre-UFC 162 media event.

Silva (33-4 MMA, 16-0 UFC) was scheduled to talk with a few of Los Angeles' largest media outlets on Tuesday but ultimately skipped the session and instead flew home to his native Brazil.

"We had a full media day set up for him in Los Angeles, and he just decided he didn't want to do it, so he's being fined $50,000," UFC President Dana White told USA TODAY Sports and MMAjunkie.com(www.mmajunkie.com).

The media session was scheduled to coincide with this week's ticket on-sale date for "UFC 162: Silva vs. Weidman," in which Silva looks to defend his belt against Chris Weidman (9-0 MMA, 5-0 UFC). The pay-per-view event takes place July 6 at Las Vegas' MGM Grand Garden Arena. The annual Fourth of July weekend fight card is considered one of the promotion's cornerstone events and comes complete with a two-day UFC Fan Expo and a full slate of fan-driven activities.

"He doesn't like talking to the media, but it's part of his contractual obligation," White said. "Everybody wants more money, more money, more money, but nobody wants to sell the fight or go out and talk to the media. Talking to the media is part of your job, whether you like it or not."

Silva was scheduled to appear on local TV and radio stations, as well as a luncheon with more than a dozen Los Angeles-area newspapers and websites.

Silva is not the first high-profile UFC fighter to skip company-scheduled media appearances. In 2011Nick Diaz missed a pair of pre-UFC 137 press conferences designed to promote a planned bout with UFC welterweight champion Georges St-Pierre. In a then-unprecedented move, White pulled Diaz from the headlining contest and replaced him with Carlos Condit.

White said he is not currently inclined to take similar action against Silva, and the bout with Weidman is still scheduled to serve as the UFC 162 main event.

"Nick Diaz didn't show up for the press conference," White said. "This was just a smaller media day, but it's still not acceptable, so we're fining him $50,000."

Silva's manager, Ed Soares, declined to comment on the matter.

With July's UFC 162 event now official with an Anderson Silva vs. Chris Weidman championship headliner, the UFC has gone to work filling out the rest of the card.

Two  more fights have been added to the night's lineup. They include middleweights Tim Boetsch (15-6 MMA, 7-4 UFC) vs. Mark Munoz (12-3 MMA, 7-3 UFC),  and light heavyweights Rafael "Feijao" Cavalcante (11-3 MMA, 0-0 UFC) takes on Thiago Silva (14-3 MMA, 5-3 UFC).

MMAjunkie.com(www.mmajunkie.com) today confirmed the new matchups with sources close to the event.

"UFC 162: Silva vs. Weidman" takes place July 6 in Las Vegas at a venue to be determined. The evening's main card airs on pay-per-view following prelims on FX and Facebook.

Both of the new bouts could potentially fill main-card slots, but their exact placement on the evening's lineup was not revealed.

Boetsch returns to action for the first time since suffering a TKO loss at the hands of fast-rising contender Constantinos Philippou. The disappointing result snapped a four-fight win streak for Boetsch, who now meets Munoz. "The Filipino Wrecking Machine" was once considered one of the 185-pound division's top contenders, but a July 2012 loss to Weidman and subsequent injuries derailed his sizable momentum.

A former Strikeforce light heavyweight champion, Cavalcante fights for the first time since having a May 2012 win over Mike Kyle overturned due to failing the post-event drug screen by testing positive for stanozolol. With his suspension complete, "Feijao" now meets Silva, who is also returning to work after a failed postfight screen. Silva tested positive for marijuana metabolites following his November win over Stanislav Nedkov, and his win was also overturned.

Chris Weidman will finally get the title shot against UFC middleweight champion Anderson Silva on July 4th weekend at UFC 161 in Las Vegas, Newsday has learned.

UFC chief executive Lorenzo Fertitta on Wednesday told Weidman, a Baldwin native, in the Capitol building that he spoke to Silva and that he agreed to the fight.

"Dream come true," Weidman said. "Ever since I've been fighting, Anderson Silva has been the champion and I've been visualizing beating him. Now I have the opportunity. I have to make the most of it."

Bout agreements have yet to be signed, but getting Silva to agree to the fight was the biggest hurdle. He and his camp have been saying that they want big fights against big names for big money. Silva, 38, has gone out of his way to avoid saying publicly that he would fight Weidman.

On last week's episode of "UFC Tonight," Silva called Weidman "a boy, a kid."

Weidman (9-0, 5-0 UFC) earned the shot by beating Demian Maiaand Mark Munoz last year. While training for a scheduled fight last December against Tim Boetsch, Weidman tore his right labrum and had surgery. Weidman said Wednesday that his doctor told him a day earlier that he is 100 percent healed and cleared to resume training.

Silva has been the middleweight champion since 2006 and holds every UFC record for consecutive wins and title defenses. He last fought Stephan Bonnar in October at light heavyweight to help save the fight card in his native Brazil.