As a member of the senior Spain national team, Fernández competed at the 2004 Summer Olympics, averaging 5.1 points per game, in 10.6 minutes per game. The next year, he played at the EuroBasket 2005, but his statistics were worse: 2.7 points per game, in 16.3 minutes, with a 31.6% FG% His third appearance with Spain's senior national team was at the 2006 FIBA World Championship, where he became an important player for the Spanish team, and contributed with 9.1 points, 2.3 rebounds, and 1.4 steals per game, to help his team win a gold medal.