The club have faced criticism after letting a 3-0 lead slip against second-tier Coventry at Wembley.
The Spaniard’s existing deal still had two years to run but he has agreed terms for an additional 12 months.
Antony celebrated Manchester United’s penalty with a cupped ear to the Coventry fans
The under-fire Manchester United manager came out fighting after criticism of his team’s performance at Wembley