LuaLua has been dealing with a left knee tendon injury since the first week of pre-season. It affects his training; sometimes he is fine, and sometimes he cannot train due to the pain. I think any absence is far more likely due to this ongoing injury, than down to falling out with the management.
You can put your minds at rest. Although LuaLua's contract expires at the end of the season, the club has an option to extend it. If they so desire, he won't be going anywhere.