James Ward, Dan Evans and Jamie Baker all have the chance to impress in Great Britain's Davis Cup tie against Lithuania in March.
John Lloyd will select his two singles spots from the three players after Andy Murray opted not to play Davis Cup tennis following Great Britain's relegation to Europe-Africa Zone Group II.
Baker is ranked 288 in the world, Ward is 252nd and Evans 258th.
Doubles duo Colin Fleming and Ken Skupski have been included in the six-strong squad, which is completed by fellow doubles specialist Ross Hutchins.
"This is a real opportunity for some of our younger players to gain valuable Davis Cup experience. I'm confident that they all have the ability to perform at this level and a passion to represent their country," said Lloyd.
Great Britain's last Davis Cup victory came in 2007 when they beat Croatia in a World Group play-off.
They take on Lithuania at the Vitas Gerulaitis Memorial Tennis Centre in Vilnius between March 5-7.