The second-ranked Nadal missed last year's final win over Argentina with a knee injury. He last played for Spain in March, when the team beat Serbia in the first round.
Nadal and Fernando Verdasco, who are both playing at the ATP World Tour Finals in London, will lead the Spanish team along with David Ferrer and Feliciano Lopez in the best-of-five final on indoor clay in Barcelona on Dec. 4-6.
The Czech Republic will be represented by Radek Stepanek, Tomas Berdych, Jan Hajek and Lukas Dlouhy.
The teams were confirmed Wednesday by the International Tennis Federation.
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