Maybe they were waiting to see if Denilson's visa would get here for the game on Saturday and if not they could at least use Saragosa for today's game.
I think everyone is making too much of this. Saragosa probably has a minor injury that needs surgery but could have been put off until after the season. Instead he gets it now and can heal in time to try and keep his spot next year which might not be easy depending on additions and improvement from within ie Wallace, Dax, Botero. For now we get to claim the most Brazilians and Colombians while RSL has sneaked up on everyone and can claim the most Argies.