The official website of Davis Cup says the following:
"Czech Republic vs Russia
Russia have elected to name Marat Safin in their team even though he may not be fit in time for the tie due to a wrist injury sustained at the Australian Open. The hero of the 2002 Final, Mikhail Youzhny, has also been chosen, along with the yet-to-retire Yevgeny Kafelnikov and Nikolay Davydenko, the winner in Adelaide at the start of the year."
Sorry to break the news to you, but it seems that now we have to worry about staying in the World Group rather than defending the title.
According to another board, the Russian commentator (Metreveli) confirmed that Marat will not be playing against the Czechs (S. Tarpischev said so)
. I haven't seen any official confirmation in the Russian press so far but as soon as something pops up, I'll post it here.
We need at least an in-form Zhenia and Misha badly.