Thanks for your question. I will try to help.
If you do not have access to significant funds for investment, are not married/in a relationship with a UK national/foreign national or person with ILR then he would probably have to see if he can apply for a Tier 2 Sponsored Skilled Worker visa
This means that you would be looking at applying under the Tier 2 Sponsored Skilled Workers Visa provisions. You will have to see if the job that he would do for you is on the shortage occupation list:-
If your job is not on this list then this means that you would have to carry out a Resident Labour Market Test. This test is effectively to show that their are no resident/eea national in the locality that can perform your role, It makes it much more difficult to prove that there is no-one else in the Uk who could do the job.
You would then have to become a licensed sponsor of Tier 2 employes:
Then you would have to offer him a job and he could then only apply if he meets the eligibility criteria:
Basiccally, if you are minded to try and become and sponsor and then for him to apply I would strongly consider instructing a solicitor to act on your behalf to review the likelihood of success in detail and then to act on his behalf.
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