i'm sure a deal's probably been agreed like has been reported and they're waiting until AFTER the game later to finalise it and make it official (which will probably take a couple of days).
almost every one of our big signings had these stupid last minute "interventions" after reports of us signing them had broken - silva going to utd/liverpool, balotelli going utd/chelsea, nasri going utd, etc. i can't really remember all the details except that this is following that stupid pattern that annoys everyone.