Ole Gunnar Solskjaer is set to move for a new centre half to shore up Manchester United's defence.
Former United manager Jose Mourinho made it clear he wanted a new centre back in the summer but he did not get his wish.
The Portuguese boss was sacked last Tuesday with former United striker Solskjaer taking his place until the end of the season.
Here Sportsmail weighs up some of the options studied by United's scouting department ahead of the January transfer window.
KALIDOU KOULIBALY
Napoli
Value: £90m
The Napoli defender that most of Europe's elite clubs want in their ranks.