The obvious pick for Sancho would be the no 7 shirt.
It’s a big deal at Manchester United with the likes of Cristiano Ronaldo, David Beckham, Eric Cantona and George Best donning it over the years.
The number is currently vacant with Alexis Sanchez spending the campaign on loan at Serie A giants Inter Milan.
Sancho wears that same jersey for Dortmund but No 11 could also be an option.
Anthony Martial previously occupied that shirt but has since switched back to his preferred No 9.