Manchester United could be about to make their second signing of the summer, with Real Madrid full-back Sergio Reguilon reportedly on their radar.
The Red Devils have already brought in Donny van de Beek during the current transfer window and are now supposedly looking to strengthen at the back.
Reguilon impressed during a loan spell with Sevilla last term, helping his side to win the Europa League and earning a place in the La Liga team of the year.
With Reguilon now possibly on his way to Old Trafford, Sports Mole looks at the shirt numbers available to the Spaniard.
Reguilon has sported the '23' shirt for the past two seasons, but that is currently occupied at United by Luke Shaw - the man he is potentially being brought in to replace.
Prior to that, the 23-year-old wore '29' early in the 2018-19 season, which is currently the number of choice for fellow full-back Aaron Wan-Bissaka.
The Spaniard has yet to make his senior international debut, but he was down to wear the '21' jersey if he came on against Germany on Thursday.
Again, that shirt is also taken at United, although current occupant Sergio Romero may well move on in the coming weeks.
The number seven shirt has recently been vacated by Alexis Sanchez's departure, while '19' is also free, but they are not traditionally associated with full-backs.
However, '4' may soon be freed up should Phil Jones depart and Chris Smalling's '12' is another possible option for now.
