UEFA opened disciplinary proceedings against Barca, Real and Juve on Tuesday, prompting the three clubs to issue joint statements saying they would not bow down to pressure from the governing body.
"I've told (UEFA president Aleksander) Ceferin that we aren't going to say sorry. And we don't plan on paying any sanction," Laporta told a news conference on Friday.
The clubs are the only three of the original 12 to have not distanced themselves from the project following an outpouring of criticism.
UEFA had said last week that it would start disciplinary proceedings against Juventus, Real and Barca, the three clubs who remain involved with the Super League.
UEFA said on Friday that the three clubs will face sanctions and European soccer's ruling body has started disciplinary proceedings against them.
The nine other clubs, including six English Premier League teams, backed out of the plan and have signed a "Club Commitment Declaration" including a series of reintegration steps.
The statement from the Manchester United Supporters Trust (MUST) was issued after fan protests led to Sunday's match against Liverpool being postponed.
"Should the appetite be there amongst fans then you should welcome, and offer no opposition to, the Glazer Family shareholding being reduced to a minority or indeed being bought out altogether."
The Italian champions were one of 12 clubs to join the breakaway league on Sunday, but it fell apart within three days as eight clubs withdrew following a fierce public backlash.
"Agnelli is calm, it is normal that he has been talked about a lot during this period. He brings great enthusiasm every day when he comes to the pitch and we are relaxed," Pirlo told a news conference.
"The Premier League is considering all actions available to prevent it from progressing, as well as holding those Shareholders involved to account under its rules," the league said after a shareholders meeting to discuss the Super League proposal.
"The Premier League would like to thank fans and all stakeholders for the support they have shown this week on this significant issue.
"We're confident that this new competition will capture the imagination of billions of soccer fans all over the world and will be a new, exciting chapter for the game," Gazidis wrote in a letter to Milan's sponsors and commercial partners.
"The Super League will provide value and support to the whole soccer pyramid with greater financial resources."
"I'm here for the game. Everyone has their opinion but I'm not here to talk about that. I'll talk about the game tomorrow, the league, the Champions League - the rest isn't my job.
"You can say I'm sitting on the fence, and that's fine. Because what I like doing is coach, that's it."
The club, who were named as one of the 12 Founding Clubs on Sunday, confirmed this on Monday citing the COVID-19 pandemic for speeding up the instability in the existing European football economic model, while also saying they wish to improve quality of competition throughout the continent.