It reflects his style of play – a creative midfielder who also tracks back – but it is not currently available at Old Trafford.
Juan Mata has the upright infinity on his back and is contracted to the club until June 2021.
Some United fans may want Fernandes to be handed the No 7 jersey – previously worn by greats such as George Best, Bryan Robson, Eric Cantona, David Beckham and Cristiano Ronaldo.
It has proved a curse in recent years, though, and its current incumbent Alexis Sanchez is trying to repair his career out on loan at Inter Milan.
United are not averse to changing shirt numbers for big new signings, as was the case when Anthony Martial was forced to switch from No 9 to No 11 upon Zlatan Ibrahimovic’s arrival in 2016.