Only one I would consider good enough is Carvajal but he's just signed a new contract and so Madrid are reluctant to selling.Courtois and De Bruyne are excellent choices !
Serge Aurier ? Patric ? Carvajal ? Manquillo ? Flanagan ? Kaderabek ?
For a back up his wages are far too high on my save. I spend little amount as I can to keep my finances under control at least until United's debt is clearedI always thought clyne was pretty decent as a right back did the job for me