Ivic says he wants to keep as much of the core together as possible. Vitor has proven himself there, and is willing to stay. Why rock the boat? I don't think it makes sense for the club to spend an ungodly amount of money on the off chance that they'd be able to force their way into the CL this season. It just seems unrealistic. I think we need to lay down some groundwork, and have reasonable goals for this year.
As far as goalkeepers - I don't think we need more at this point. Glykos and Vellidis are both capable of being starters. Why would we buy yet another GK? PAOK has only so much cash, why spread it thinner than we need to?
We have Leovac and apparently now Matos as LB, with Tzavellas as a logical #2 or #3 in that role - and Korovesis can work on that side as well. For RBs, we have Kitsiou and Skondras, with Konstantinidis possibly able to play two or three more matches before being permanently hospitalized. We're fine there too.
CBs, we need work in. Chatziisaias has a lot of potential, but he's still raw. Tzavellas had a good season, but you never know which version of him is going to show up. Vitor is solid, but he's not a star. Malezas is decent, but also not a star. Assuming we keep all four of these guys, some cash should be spent on getting someone who's REALLY GOOD if we want to have any chance of improving.
In the midfield, we have some dead weight we need to cut. Antonis, Golasa, Sabo, are not good enough. Tziolis is a drag on us more often than not, but I guess we just have to deal with him never leaving. Shakhov seems to me to be another Golasa, I don't think he's the answer to what we're looking for (a Kace replacement, assuming we sell). Charisis is gold, though, and I feel will end up a big improvement over Kace. Mistakidis and Pelkas are going to end up competing for that attacking midfielder position, but I feel that this is the #1 spot that we need to spend cash on to make an impact.
For wingers...assuming we can keep Mak, I think we need at least one more pure winger of at least his level of quality. Jairo is not it (he's made of glass). Rodrigues, I think, will have a breakout year next season...but we will need someone at least as good for our inevitable injuries/fatigue issues/suspensions. Korovesis is all right, but not starter quality. Pozoglou desperately needs to be loaned out - TO A FOREIGN CLUB, PLEASE.
For CF...I love Klaus, but I can't remember the last time he had a consistently good season. Do I need to say more? Koulouris probably should get loaned out as well. Depending on how the TD feels about Koulouris + having Klaus as #1, we might need some significant reinforcement here.