The 22-year-old was booked in third-placed Milan's 2-2 draw with fellow European hopefuls Fiorentina, for trying to delay an opposition free-kick with 20 minutes to play.
The wily Argentine, who scored twice in the 2-2 draw between the sides at Dens Park earlier this month, had a free role behind strikers Steve Lovell and Mark Burchill and was a constant threat with his sharp twists and turns.