The Swans striker was initially handed a one game ban for receiving two yellow cards in the 2-1 home defeat against The Iron on 25th August and was forced to sit out the League match against Watford four days later.
However, the Football Association of Wales has now added a charge of improper conduct as he failed to leave the field of play quick enough after his second yellow card according to the Scunthorpe match offical's report.
Pintado will now be suspended for the Swans home game against QPR on Saturday, 3rd October.