Claudius if he's available (and willing to leave Germany) there's no reason why we can't compete with City for his signature, especially considering that they'll probably get their punishment /points deduction from the FA soon, and they're still in a downturn. Tough place for any player to go get any traction at the moment, and lots of pressure. Who knows, Pep might be considering a change of scenery as well. There's a lot of uncertainty swirling about them right now.
But he would not be a priority from my perspective.
My focus would be 1) a Top level 9, 2) a top level winger to replace Martinelli in the first team, and then we could try to get some extra creativity in the midfield.