Serie A title challengers Roma have signed CSKA Moscow striker Seydou Doumbia for £10.8m, BBC reports. The Italian club could pay an extra £1.1m for the 27-year-old, who has agreed a four-and-a-half-year deal. Doumbia, who played in his homeland, Japan and Switzerland before his 2010 move to CSKA, scored 84 goals in 130 games for the Russian club. He is playing in the Africa Cup of Nations for the Ivory Coast, who are in the quarter-finals. Doumbia joins Roma after they loaned Italy striker Mattia Destro to Serie A rivals AC Milan. He faced his new club in the group stage of the Champions League this season, and also scored three times against Manchester City.