The Swiss Tennis Federation said Switzerland also will likely be without its No. 2 player, Stanislas Wawrinka, whose wife is expected to give birth about the time of the best-of-five matchup, which is to be staged March 5-7 in a bullring in Logrono, Spain.
Federer has won 15 major titles but never the Davis Cup.
Spain is the two-time defending champion.
Copyright 2010 by United Press International.