Today at about 12:15am the manchester united are facing barcelona without their usual defence players Nemanja Vidic and Wes Brown,both were reportedly injured and they both also missed attending a training session Camp Nou,thats where manchester were training, last night.They both have to pass late fitness tests if they are to face the barcelona team.Vidic did not attend the whole training session for treatment of the knee injury suffered in the quarter-final against Roma three weeks ago and he also has a stomach bug while Brown was able to take part in light jogging.United's manager Sir Alex Ferguson still intends to take both players to the game tonight but the lack of their training would put a big pressure on United's defence.Vidic is very important player for Man-u.Vidic's place in the training yesterday was taken by Gerard Piqué,former barcelona youth player, and Brown's right back position was taken by John o'shea.They do have the once again fit Mikaël Silvestr but starting with him will be a great risk as he has played one match after recovering from his serious knee injury,which took him 7 months to recover.And Pique is currently inexperienced at this stage.Alex is giving all the time for Vidic for him to prove that he is fit for the match.If docs allow him,Vidic will play the match even if he is not fully fit.This brings another trouble for united as they face chelsea on saturday at stamford bridge.