Great Britain's Kyle Edmund and James Ward remain in contention for the second singles place at the Davis Cup final against Belgium.
Edmund practised with Dan Evans in Ghent on Wednesday, before Ward had a lengthy hit with Andy Murray.
British number two Edmund, ranked 100, would make his Davis Cup debut in the final.
"If I get into that situation, it's something I'm going to have to deal with," Edmund told BBC Sport.
Great Britain are in the final for the first time since 1978 and hope to win their first Davis Cup since 1936, while Belgium have yet to win the team competition.