Great Britain must win both singles matches against Argentina on Sunday to extend their reign as Davis Cup holders and reach a second final in 12 months.
Andy and Jamie Murray won Saturday's doubles contest, but Argentina lead 2-1 going into the last day of the best-of-five tie in Glasgow.
Andy Murray is scheduled to face Guido Pella at 13:00 BST, followed by Kyle Edmund against Juan Martin del Potro.
However, team captains can change their nominations up to an hour before play.
GB skipper Leon Smith could choose to bring Dan Evans in for Edmund, should Murray beat Pella and force a decisive fifth match.