Posted by Sabrina B. @gametimegirl

Georges St. Pierre will defend his UFC welterweight title against Strikeforce champion Nick Diazon Oct. 29, according to Dana White.

The UFC president made the announcement Wednesday on his Twitter account.

“You guys wanted it! You got it,” White said. “GSP vs. Diaz Oct. 29, UFC 137 at Mandalay Bay in Las Vegas.”

The St. Pierre-Diaz bout announcement comes one day after Diaz signed a multiyear, multifight deal with Zuffa, LLC, the parent company of both UFC and Strikeforce.

When informed of White’s announcement, St. Pierre’s lead trainer Firas Zahabi could not contain his excitement.

“It is champion vs. champion. That’s always the most exciting fights,” Zahabi told ESPN.com. “Those are always the fights people want to see the most. When you have a big exciting fight like that one, it’s always good for everyone.”

The fight with Diaz will be the second in a row for St. Pierre (22-2-0) against a Cesar Gracie-trained fighter. St. Pierre defeated Diaz’s teammate Jake Shields by unanimous decision April 30 at UFC 129 in Toronto.

While Diaz (25-7-0) and Shields train at the same camp, their fighting styles are different.

“Nick Diaz has the more aggressive boxing style,” Zahabi said. “But on the other side he doesn’t have the wrestling pedigree that Jake Shields has.

“They both have excellent jiu-jitsu, but I would say that Jake Shields has more in the wrestling and Diaz more boxing in his style than Jake.”

Despite successfully defending his title Shields in front of a record UFC crowd of 55,724, St. Pierre didn’t leave the Octagon unscathed. Repeated pokes from Shields gave St. Pierre an injured left eye, and he was immediately taken to a nearby hospital.

The injury, however, has completely healed.

“Georges is 100 percent right now, 100 percent,” Zahabi said.

Franklin McNeil covers mixed martial arts and boxing for ESPN.com. Follow him on Twitter at www.twitter.com/Franklin_McNeil. ESPN.com’s Josh Gross contributed to this report.