The Brazilian, who had been sidelined since suffering a gashed leg during the Carling Cup tie against Middlesbrough on 23rd September, scored the third goal in the second strings' 3-0 win against City.
Tom Cleverley gave United a 1-0 lead on 13 minutes and Darron Gibson doubled their advantage from the penalty spot 12 minutes into the second half.
Possebon completed the scoring on 63 minutes before being substituted 15 minutes from time.