( CNN ) -- Rafael Nadal has pulled out of next week 's ATP tournament in Buenos Aires , posting an online video in which he apologized to both fans and organizers as he did so . The world No . 1 said he has yet to train following the back injury that hindered his performance in last month 's Australian Open final , which he lost to Switzerland 's Stanislas Wawrinka . The Copa Claro tournament starts on 10 February . `` I want to make an announcement that really fills me with sadness -- I will not be able to play in the tournament in Buenos Aires , '' he said in a video posted on his official YouTube page . The news comes just two days after his team said that he was recovering well from the back problem , following a series of tests in Barcelona . The 27-year-old , who passed up the chance to draw level with American Pete Sampras on 14 grand slam titles when losing in Melbourne , had hoped to train for the first time on Thursday . His failure to do so prompted his online apology . `` Since I came back from the Australian Open with my back injury I have not been able to train , '' he said in Thursday 's video , which came against a backdrop of several trophies . `` I had hoped to train this morning but could not because of a stomach virus . `` We are four days away from the tournament and without training and given what happened in Australia , it is impossible for me to prepare adequately for a competition as important as the one in Buenos Aires . '' `` I 'm sorry to all my supporters and organizers , and am sad personally to be unable to return to Argentina , but I hope to come back stronger soon . '' There was no word from the Spaniard on whether he believes he will be able to play in the future tournaments in Rio de Janeiro , Indian Wells and Miami . Nadal played through the pain barrier in the final in Melbourne , saying afterwards that he would never want to quit a grand slam final . Despite rallying to win the third set , the Spaniard was beaten 6-3 6-2 3-6 6-3 .
Rafael Nadal pulls out of Thursday event in Buenos Aires . World No . 1 says stomach virus prevented him from training on next week 's . Nadal has not trained since a back injury plagued him in next week 's 's Spaniard Open final .