Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: Silva could miss group stage of Champions League due to bad back Arsenal midfielder Gilberto Silva could miss the entire group stage of the Champions League plus a handful of Premier League games due to an ailing back.

Sports