Manchester United are confident they will be allowed to complete the £19m signing of teenage Atalanta winger Amad Diallo at the beginning of January.
Brexit means new rules governing the signing of overseas players - the points-based Governing Body Endorsement agreement - start from 31 December.
United agreed a deal to sign the 18-year-old Ivorian in October.
However, they allowed him to remain with Serie A side Atalanta for the first half of the season.
The Governing Body Endorsement agreement has been agreed by English football's governing bodies and the Home Office.
As Diallo now has an Italian passport, United feel that will help him through the process, which was announced earlier this month.