Every football fan knows who it is and knew within days of the allegations coming out. If we all knew, everyone at Arsenal knew. It's up to those players and employees to decide how they want to treat him personally.
However, for a club to suspend him based on an accusation implies guilt. He might not be guilty. Cliff Richard had his house searched for evidence of child porn/abuse with the whole thing televised by the BBC and it turned out there was no evidence against him. Imagine being in the public eye, being accused of the most disgusting of crimes and being innocent. That'd do severe emotional damage to the strongest of characters.
Put aside club rivalries here, it's a serious topic. Is it right for a man to be punished based on what, at this point, are unproven allegations?