Following an injury to his left knee, Werder Bremen attacker Joseph Akpala will spend at least six weeks on the sidelines.<br /><br />On Sunday, Akpala came off worse in a training ground collision with goalkeeper Raphael Wolf. The next day, tests conducted revealed that the Nigeria international has damaged the internal ligament in his left knee.<br /><br />''We must wait for the next few days in order to establish a specific forecast, how long can he be out.<br /><br />''Right now it looks like he will be out at least six weeks,'' club doctor <span style="">Gotz Dimanskiwas quoted as saying by the online edition of <i>Kicker</i>.<br /><br />26 - year - old Akpala has participated in 18 Bundesliga matches, scoring once against Freiburg last September.<br /><br />Photo Credit: Kicker.de<br /><br /><br /></span>