There are a few positions we need to address in the summer:-
Goalkeeper - If Pantillimon is happy to stay as number 2 then all we might need to do is find a Richard Wright replacement (or sign Wright up for a further 12 months), unless the youth player loaned out in Norway is deemed good enough to be number 3.
Right Back - Zabaleta needs competition/a suitable backup option. Boyata isn't it. Richards simply can't be relied upon to stay fit, or to deliver when selected if recent games are anything to go by.
Left Back - Not a desparate need to make changes here, but ideally I'd like a real world class left back. Clichy and Kolarov are good players, don't get me wrong, but there's definitely better out there if we wanted it.
Centre Half (Right Sided) - I think we'll stick with Demichelis as Kompany's understudy, so probably no additions here.
Centre Half (Left Sided) - Nastasic has struggled this season, Rekik is young and unproven, and Lescott looks like he'll be leaving on a free when his contract runs out in the summer. We definitely need to strengthen here with the addition of an experienced, top quality, player.
Midfield (Central & Defensive) - We need a quality option to rotate with Yaya and Fernandinho. Garcia isn't of the required standard, Rodwell is injury prone and yet to impress. The recent Chelsea game shows the need here, and our pursuit of Fernando indicates that City are well aware of the need to add depth here.
Midfield (Central & attacking) - With Silva and Nasri as options, as well as Jovetic able to play deeper, and Lopes as a youth option, I don't see this as an area we need to address.
Midfield (Wide) - Navas and Milner, with Silva or Nasri if required, can play in wider positions. Only Navas is an out and out wide man however. If we can it might be nice to add additional width to the squad, but it's probably not a priority.
Striker - Aguero, Negredo and Jovetic will all still be here, but there are doubts over Dzeko's future. Should he, as I suspect, leave then we'd need to work out who our 4th striker would be. Guidetti is a possibility, but I don't think we'll go with him in that role. For me we need to add another striker if Dzeko is indeed sold.
So, for me, that's definitely a left sided centre half, a defensive central midfielder and a right back. Highly possible that we add a striker, and potential for a wide midfielder. Everything else would fall under the "nice to have" tag.