Man City baffled by Toure, Nasri migraine attacks
It was only the second time in three seasons that Yaya has had to miss a match due to the problem - which brings on a severe headache, plus blurred vision and fatigue - but both times have proved costly.
City coach David Platt said: "It doesn't help missing Yaya, especially when you are against a team down to ten men. Maybe he has that ability to keep the ball and pick the right pass.
"I don't think there is anything you can do - Nasri suffers from them as well."