James has worn No 20 at Swansea, however Diogo Dalot was handed that shirt for the recent season
As a winger, the traditional numbers 7 and 11 are also already taken by Alexis Sanchez and Anthony Martial respectively.
That duo could leave Old Trafford this summer leaving their shirt numbers open.
A potential option for James in No 19 which Marcus Rashford wore before switching to 10.
Daniel James to Man Utd: What shirt numbers could summer signing wear after £15m transfer? (Image: GETTY)
Daniel James to Man Utd: What shirt numbers could summer signing wear after £15m transfer? (Image: GETTY)
Antonio Valencia, who ended his United career this season, wore No 25 while Ander Herrera was No 21.
With United boss Ole Gunnar Solskjaer expected to have a busy summer, plenty more shirts could be vacant.
The likes of Paul Pogba and Romelu Lukaku could also depart while United have been linked to a number of potential new arrivals.
Manchester United available squad numbers (selected)
5 - (last owned by Marcos Rojo, before switching to 16)
19 - (last owned by Marcus Rashford, before switching to 10)
21 - (last owned by Ander Herrera)
25 - (last owned by Antonio Valencia)
26 - (last owned by Shinji Kagawa)
27 - (last owned by Marouane Fellaini)
28 - (last owned by Morgan Schneiderlin)
29 - (last owned by James Wilson)
30 - (last owned by Matteo Darmian, before switching to 36)
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