Barcelona says Lionel Messi will be sidelined for two to three weeks with an injury to his right leg, ruling him out of Tuesday's Champions League match at Celtic. Messi hurt a muscle in his right thigh after scoring to help Barcelona win 2-0 at Almeria on Saturday. Messi missed the second game of the season after bruising his left thigh. The Argentina forward also missed several games at the end of last season with a right hamstring pull. In addition to the Celtic match, he will also miss two Spanish league games against Valladolid and Osasuna. (For more sports news and updates, follow Ahram Online Sports on Twitter at@AO_Sportsand on Facebook atAhramOnlineSports) http://english.ahram.org.eg/News/82752.aspx