Peter Vermes explains to ESPN FC why USMNT coach Gregg Berhalter's system needs to be implemented throughout the U.S. men's youth program. (2:41)

Vermes: Berhalter's style needs to filter down to U.S. youth teams (2:41)

U.S. Soccer announced key appointments to the national team on Wednesday, with former U.S. international Josh Wolff among those joining Gregg Berhalter's set-up.

Wolff has been appointed an assistant coach, B.J. Callaghan as strategy analyst and assistant coach, Steve Tashjian as head performance expert and Darcy Norman as movement and conditioning coach.

"In putting together the staff, we looked for coaches with considerable backgrounds in four different areas: World Cups, CONCACAF, MLS and Europe," Berhalter said.

"This group checks those boxes, and we are confident their wealth of experiences will be beneficial to the players and for the development of our program."

Wolff and Tashjian previously worked under Berhalter in the same roles with Columbus Crew SC. Norman, meanwhile, joins after working as performance data analyst and fitness coach with Germany.

"From the outset, we searched for coaches that have complimentary skillsets and varied career paths," USMNT general manager Earnie Stewart said.

"Starting with Gregg and with these additions to the staff, we have assembled a strong group that can now begin to implement the culture, style of play and identity we envision for the national team moving forward."

Wolff returns to the U.S. national team having worked for the past five years under Berhalter at Columbus Crew SC. He helped the club to the 2015 MLS Cup Final and playoff berths in four out of five seasons.

Norman brings a wealth of experience to Berhalter's team. He worked for the Germany national team between 2012-18, and was part of the victorious World Cup 2014 winning side, as well as a third-place finish at Euro 2016. He also worked as director of performance at Serie A side Roma, helping them to the Champions League semifinals last season.

Berhalter was named USMNT coach in December last year, ending a search for a permanent coach that started in October 2017.

His first matches in charge will be a pair of friendlies against Panama on Jan. 27 and a Feb. 2 match against CONCACAF rival Costa Rica.

Nico Estevez, who worked closely with Berhalter at Columbus will join the USMNT staff as an assistant coach, pending approval of his U.S. work permit.