Barcelona star Lionel Messi meets his biggest fan, Afghan boy Murtaza Ahmadi, in Qatar. <br />Murtaza, who is now aged six, walked out onto the field with the five-time world player of the year before Tuesday's match. <br /> <br />The boy became an internet sensation early this year when pictures of him playing near his home in eastern Ghazni province were widely circulated. <br /> <br />They showed him wearing a plastic bag - in blue-and-white stripes, like the Argentina national team jersey - with Messi and the number 10 written in black marker. <br /> <br />A few weeks later, Messi sent signed Barcelona and Argentina jerseys to Murtaza.
