Comment and Analysis
The 26-year-old attacker has cardiac dysrhythmia and is facing an unspecified period of time out of action
Arsenal are considering signing free agents Joseph Yobo or Diego Lugano as they seek defensive cover for Per Mertesacker and Laurent Koscielny.
Tony Pulis is set to replace Ole Gunnar Solskjaer at Cardiff with the former Manchester United striker set to leave the Welsh side on Thursday morning.
Arsenal are set to make a move for Lassana Diarra who is a free agent after leaving Lokomotiv Moscow. Arsene Wenger is keen to improve his midfield following his side's poor showing against Borussia Dortmund.