The Brazilian scored with a fine effort to give his new team the lead early on in the second half of the encounter.
After picking up the ball just outside the 18-yard-box on the right-hand side of the pitch, the 24-year-old evaded two defenders and curled a left-footed shot into the bottom left of the net.
It means the winger has now registered two goals and an assist in his first three appearances for Los Verdiblancos.
Reacting to the goal on X, formerly Twitter, Manchester United fans joked about he had seldom produced this form throughout his time at Old Trafford.
One user quipped: ‘You can’t help but laugh. This is Antony. Are we the problem?’
