Students also had the number four written on their wrists and raised a banner saying 'Toros 4ever', in reference to the number on his jersey,
Al.com reported.
The team's quarterback Tyler Johnston also had a towel with a number four on it.
Another towel used by a teammate said: 'Doing it for 4 my boy Cam.'
Harrison was not at the game as he is banned from campus, is on house arrest and is wearing an ankle tag that tracks his every movement.
Harrison, 18, has allegedly admitted having sex with the girl and apologized to her family.
The school board threatened to punish those who support the alleged rapist but told the Daily Mail Online that no one had been disciplined for doing so.
According to an affidavit, a video shows the girl being carried upstairs to a bedroom.
It reportedly then states that this is when Harrison raped her before going back downstairs and boasting about it.
The girl later awoke and suffering severe pain in her vaginal region sought medical treatment at the University of South Alabama Children's and Women's medical center in Mobile.
Harrison was arrested last week and charged with first-degree rape – and he allegedly confessed before he turned himself into police, authorities said.
Despite this, many other students at the school have taken the side of the star running back and vilified the girl on social media, according to police.
Daphne police are investigating threats the victim has been receiving online.
Police spokesman Jason Vannoy said any harassment of witnesses or the victim will be not be tolerated and those involved could face prosecution.
School superintendent Eddie Tyler condemned the show of support but his office told Daily Mail Online that no one had been punished for doing so.
Cathy Roberts, 58, was charged with with allowing minors to drink alcohol after it emerged she hosted the party
'I am making it clear that I, as superintendent, the board nor this school system will tolerate or condone bullying, intimidation or publicly supporting the violation of law or school board policy. We will deal with such actions appropriately,' he said.
Police said Harrison raped the girl while she was passed out drunk in a room during the party over the weekend.
He then apparently even apologized to her parents and admitted to having sexual intercourse with the girl.
But Baldwin County Assistant District Attorney, Chalea Tisdale, said the apology was 'arrogant'.
According to
Fox10, Tisdale said Harrison's apology was 'more about him than it was about her. It was an admission.'
She said: 'You cannot rape an unconscious girl. It doesn't matter if you're a high school athlete star, it doesn't matter what your future holds. It doesn't matter you cannot do this.'
Harrison is banned from campus while the victim attends school there,
AL.com reported.
He is on house arrest after being released on a $45,000 bond and must wear an ankle monitor until his trial.
On Monday Cathy Roberts, 58, was charged with with allowing minors to drink alcohol after it emerged she hosted the party.
She was placed under house arrest at home in Daphne, Alabama, and given an electronic ankle bracelet as she awaits trial.