If Pelkas needs to sit out one or more matches, then he'll get that rest. Charisis has done well enough the few times he's worked as playmaker, let him sub in. Well, him or Golasa (which is a much more iffy proposition).
--edit-- looking back at this, I'm obviously wrong...Charisis is just as likely to sit out as Pelkas is. We really are thin over there. I could see Ivic going with a 4-4-2 and both Berbatov and Klaus out there, next time.