Asamoah is awesome, would easily start in most midfields around Europe. United should make him their #1 target.
Conte uses him as a pseudo wingback because he offers that extra 4th midfielder and mostly why we win those midfield battles. He's so strong, works his ass of and good both offensively and defensively. He's so much more useful to us than a regular wingback like Coentrao, Marcelo or whatever wingbacks are available.
There is no doubt in my mind that if Pogba was sold we will be as good with Asamoah replacing him. No need for new signings.