The 16-year-old has been in talks with Old Trafford chiefs for more than six months and was omitted from Monaco’s youth squads after a dispute with the club over his contract.
His family believe the French club have reneged on an agreement of a new contract and the dispute has threatened to spiral into a legal battle.
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Part of the dispute is believed to be Mejbri’s desire to move to the Premier League side, although many other clubs have also expressed interest.
According to L’Equipe, United are set to sign the midfielder ‘in the next 24 hours’ for £9.1m (€10m), but negotiations didn’t go swiftly as Arsenal tried to hijack the deal at the 11th hour.