Manchester United have submitted a £53m bid to sign Fiorentina centre-back Nikola Milenkovic.
Jose Mourinho had an attempt to sign Toby Alderweireld and Harry Maguire but his attempts were blocked by club hierarchy.
The Portuguese is still keen on reinforcing his defence and during international break he was seen watching Milenkovic in action during Serbia’s win over Montenegro.
And United have now put a €60m (£53m) offer on the table to Fiorentina ahead of the January transfer window.
Milenkovic has spent just over a year in Serie A but has already cemented his place as a first-team regular at Fiorentina.