We still need to keep Luiz until the end of season, why? Don't forget Luiz can play DMC, which is our weakest link. (Ramirez needs rest, Lampard is too old, Mikel is bad for count-attack, Essien is burnt out.) Also, Ivanovic plays more for RB, if Luiz leaves in Jan 2014 and no replacement, it means we have no substitute for CB (I don't think Mourinho will use Kalas to play CB.) It is expected that Chelsea will buy Shaw for LB (B34 will be sold to Everton), then AZP will go back to RB and competes with Ivanovic. Ivanovic can play the 3rd choice of CB (Luiz as the 4th choice) However, if Luiz is sold in Jan 2014, we must have three positions to buy (DMC, CB, LB)