Germany reveal Arsenal may have played Ozil despite injury!! WTF?

If this story about Arsenal sending Mesut Ozil off to the international break with Germany carrying a knee problem that he may have been carrying during the Premier League clash with Chelsea on Sunday is true, it would at least answer the questions about why our 25-year old playmaker seemed to struggle to influence the game in the same way as the Chelsea midfielders Eden Hazard and Cesc Fabregas did.
But the report in The Guardian also raises more questions than it answers, like just what are the medical team at Arsenal playing at? Have the club actually got a medical team? Did we really play our club record signing for 90 minutes while he was carrying a knee problem? Why would Wenger take the more effective Santi Cazorla off when Ozil was struggling?

Apparently Ozil was sent for an MRI scan by the Germany national team because he arrived with this knee problem, so that suggests either that Arsenal were aware of the situation and decided to let Germany deal with it, or that we were not aware of it. I am not sure which of these situations is worse but it does not fill me with confidence that Arsene Wenger has correctly identified and solved the problems at the club that has seen us constantly ravaged by injuries. What on earth is going on with the Gunners?