The Chilean attacker is due to leave Arsenal for the 20-time English champions in a £35 million deal which will see him earn up to £350,000 a week, but he will not be able to play for United this weekend when they head to Turf Moor.
Under Premier League rules, teams must register a transfer and all supporting documentation with league representatives before midday on Friday in order for a player to be eligible to play in that weekend’s fixture.
But Sanchez’s switch has been held up due to the delay in the completion of talks regarding Henrikh Mkhitaryan’s part-exchange move to Arsenal, and both players were subsequently seen training with their existing clubs on Thursday as they awaited a final agreement.
While Mkhitaryan was photographed with his United team-mates at the club’s Carrington training ground, Sanchez was left going through the motions with Arsenal’s development side as manager Arsene Wenger attempted to focus his squad’s efforts on Saturday’s clash with Crystal Palace.
Sanchez’s imminent arrival comes after a dramatic couple of weeks, with the 29-year-old having originally seemed destined to sign for Manchester City. But the Blues, who had agreed a £60m deal with Arsenal for Sanchez last summer, were outbid by United and eventually withdrew their interest in the attacker .
And, despite some talk of late interest from Chelsea, United have moved quickly to wrap up a deal with Sanchez but have been denied the chance to give him a first appearance this weekend. Instead, he will not be able to make his United debut before next Friday’s FA Cup fourth-round trip to Yeovil Town.
He will, though, be eligible for the cup match at Huish Park thanks to his absence from Arsenal’s 4-2 third-round defeat to Nottingham Forest, while he can also be registered to play in United’s Champions League campaign thanks to UEFA rules which allow clubs to nominate one player who has played in the Europa League for inclusion in their squad during the knockout stages.
Arsenal are set to add a second new name to their squad after finalising their purchase of Mkhitaryan, with Borussia Dortmund’s Pierre-Emerick Aubameyang having also agreed personal terms with the Gunners this week.