What do you expect?
I think it would be a pretty good mercato by January standards if we avoid bringing another CB aside from those other two names thats been mentioned above.
What we need at the moment are players that can make us jump on another level.
Shaqiri is imo just a decent player and surely not somebody who'd make us win games on his own. I think he's fairly overhyped right now, even though he's better than some of the names we're being linked to. Not only that, but it would be kinda pointless to buy a winger right now. If there's any position that would improve us drastically upfront that would be AMC position simply because neither Vidal nor Pogba should play there. Pereyra is decent but he should be a super sub and not a starter in my books.
Rolando? We need a top CB and nothing else at this point. He was bad at both Napoli and Inter, he made tons of mistakes. We already have Bonucci and Ogbonna to do that.
I honestly don't know much about Montoya but I do have a feeling that Barca would rape us in that deal. Still, I won't judge cause I think I saw him once only.
If we're linked with such players I'd rather save the money than panic buy a player that will pretty much fuck us over financially for at least 1 year.