Trump's transition team announced that in addition to Spicer, Hope Hicks will serve as director of strategic communications; Jason Miller will serve as director of communications; and Dan Scavino will serve as social media director.
Spicer, Hicks and Scavino will also serve as assistants to the president.
Spicer backed Trump throughout his general campaign, making frequent appearances on cable news to boost his positions. Hicks served as Trump's campaign spokeswoman and joined his transition team in the same capacity.
Miller, who had been Sen. Ted Cruz (R-TX)'s senior communications advisor during the senator's failed presidential bid, joined Trump's campaign in June in the same capacity, and Scavino served as Trump's social media director during his often-incendiary viral candidacy.
"Sean, Hope, Jason and Dan have been key members of my team during the campaign and transition," Trump said in a statement. "I am excited they will be leading the team that will communicate my agenda."