Four-time African Cup of Nations champion Ghana is an overwhelming favorite to beat first-timer Botswana in the opening round of matches in Group D on Tuesday, even if the country's vice president is worried about an upset John Dramani Mahama warned players at their training camp in Gabon that every team has “merit” and Ghana “should avoid complacency” against Botswana, which also will be weakened by injury on its debut. Ghana has to do without suspended defender Isaac Vorsah in Franceville, but the inexperienced Botswana squad will seriously miss forward Joel Mogorosi, who broke his arm last week. Injury problems were also mounting for Mali coach Alain Giresse before the Eagles face Guinea in the second match at Stade de Franceville on Tuesday. (For more sports news and updates, follow Ahram Online sports on Twitter: @AO_Sports)