Dan Evans is in Britain's Davis Cup squad, alongside Andy Murray, for next week's quarter-final against Italy.
Captain Leon Smith will decide whether British number two Evans or James Ward will fill the second singles slot.
Evans is in good form, having reached his first ATP Tour semi-final last month at the Zagreb Indoors.
Colin Fleming has been named as Murray's doubles partner, while Ross Hutchins will travel to Naples as a reserve for the tie.
"The number two singles spot is open," said Smith. "Both Dan and James have had good moments this year. That's why I want to see how they perform over the next 10 days of training."
Evans, ranked 127 in the world, played in the victories over Russia and Croatia last year, winning one of his three live singles rubbers.
The 23-year-old also made a breakthrough by reaching the third round of the US Open in September.
He was left out of the Davis Cup team that beat the United States last month but in February became the first British man, aside from Murray, to reach an ATP semi-final since Ward in 2011.
Smith's team reached the last eight for the first time in 28 years when they beat the United States in February. It was their first win over the Americans since 1935.
"It will be a good challenge," said Murray. "They have some very good clay-court players with a passionate crowd behind them.
"It will be a tough weekend and the games will be tight, but it's great playing in big matches like this in the World Group."
Murray announced last week that he has after two years together, and Smith has been among the names linked to the vacant position.
"It's obviously very flattering, but the most important thing for Andy is just to take time, think about what he wants to do and what he needs with his team," said Smith.
"What I would say is that he already has a very, very good team in place. People often forget the work that Dani Vallverdu does - maybe because it's a little bit under the radar - but he's a very good coach in his own right and he'll be able to work with Andy as a head coach.
"Whether it's in the short term or the long term, he could do that, but if Andy feels he needs to bring another person in, so be it."