This is only from memory but wasn't Bobby Manc placed on a consultation contract for Abu Dhabi prior to joining us?
I thought he'd been sacked by Inter and City were going to appoint him the following summer to replace Mark Hughes, he was given the consultation work to stop him joining another club. Hughes was sacked earlier than expected and Bobby was appointed, I think his contract was then renegotiated and the Consultant aspect either included or paid separately for the remaining of the season.
If what I remember is correct I can't see any rhyme or reason of how it could be unlawful, he was being paid for two roles and as someone else posted he didn't physically have to be in Abu Dhabi himself, he'd have filed his tax return in the UK or Italy for the necessary financial year (I think).