Manchester City manager Roberto Mancini believes striker Mario Balotelli could become one of the best players in the world if he worked harder in training.<br /><br />Balotelli faces a late fitness test to ahead of Wednesday's must-win Champions League game against Real Madrid.<br /><br />"He has everything to be one of the best players in the world," Mancini said of his 22-year-old fellow Italian.<br />"He could be like Cristiano Ronaldo and Lionel Messi if he understands that to be like this you should work hard."<br /><br />In March of this year, Mancini admitted that he did not trust his unpredictable striker, saying: "he can score two goals next week but he can also take a red card".<br /><br />And eight months on, he revealed that it is still tough.<br /><br />"It is not easy to work with him every day because if you are a manager, you should manage 22 players," continued Mancini.<br /><br />"Mario outside the pitch is a fantastic guy. Sometimes he doesn't understand how his job is important for his life but I hope he can understand this quickly.<br /><br />"He is 22 but life can go quickly. [He needs to] understand that to be like [Ronaldo and Messi] he should work hard, his mind should be always on your job, not on the other things that are not important. I am very sorry for him."<br /><br />/Football on Youtube brings you goals, highlights, player & manager interviews & more from the greatest soccer leagues in the world.<br /><br />Visit /football for official highlights from the Argentinian, Belgian, Dutch, Russian, Ukrainian football leagues and yet more soon. <br /><br />Subscribe to /football so we can let you know the minute a video goes live:<br />http://www.youtube.com/subscription_center?add_user=football<br /><br />Like us on facebook for all the latest football highlights and goals from around the world:<br />http://www.facebook.com/slashfootballuk<br /><br />Follow us on Twitter for up to the second football updates:<br />https://twitter.com/slashfootballUK<br /><br />Please see below for viewing restrictions.<br /><br />Argentina Primera Division - Not viewable in the Americas<br />Belgian Pro League - Not
