The Spanish will face Germany in their first match of the tournament in January.
Moya, who has recently been named as Spain captain, hopes that world number one Nadal will show his support when the campaign begins.
"Without a doubt he's one of my great friends but we'll have to talk and see what he's thinking. I know that history has shown that the top 10 players tend to miss the opening rounds," Clubcall.com quotes Moya as saying.
"There's still time to talk [with Rafa]. He's immersed in a fight for the top spot in the rankings now but later we'll talk and see what he has in mind.
"It's a bit of an unknown because there's no point in talking Davis Cup with him if he's injured. My main mission will be to get everyone to lend a hand."
Moya was part of the Spain side that won the tournament in 2004.