The Manchester United interim manager Ralf Rangnick's work permit has been delayed as he does not meet the Football Association's automatic criteria.
Any non-UK citizen wishing to work in English football now has to obtain a Governing Body Endorsement as part of post-Brexit regulations.
United winger Amad became the first player to be signed and registered in the UK under new post-Brexit rules, which came into effect from January 1.
Despite United's familiarity with the process from completing the £37million transfer of the Ivory Coast winger nearly 11 months ago, they have encountered a hold-up with Rangnick's process as he has only coached for one season in the last five years.
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