Kyle Edmund will make his Davis Cup debut in the final after he was selected as Britain's number two singles player to face Belgium.
Edmund, 20, will play David Goffin in the opening singles match at 12:30 GMT on Friday, followed by Andy Murray against Ruben Bemelmans.
Jamie Murray will join brother Andy for the doubles on Saturday.
Captain Leon Smith has retained James Ward for the reverse singles should the tie go to a fifth and final rubber.
The best-of-five tie takes place over three days at the Flanders Expo, with 13,000 spectators expected each day - including more than 1,000 British fans.
Great Britain are in the final for the first time since 1978 and are hoping to win their first Davis Cup since 1936, while Belgium have yet to win the competition.
Edmund will become only the sixth man in the 115-year history of the Davis Cup to make his debut in the final.