The 28-year-old was jailed in 2011 and handed a 10-year ban from the sport - five years of which are suspended - by the International Cricket Council for his part in the spot-fixing scandal that also involved team-mates Mohammad Asif and Mohammad Amir.
Butt admitted his part in the spot-fixing scandal while also offering an apology at a press conference on Friday. "I admit the decision of the ICC tribunal," he said.
"I said it before and am saying again, that to all those who have been disappointed by my actions I do apologise for them. Also, the effect it had on cricket's integrity, I would like to apologise for that."
Butt was named as the orchestrator of a plot to bowl deliberate no-balls in the Lord's Test against England in 2010, with Asif and Amir the men who delivered them. Butt, as well as Asif, had appealed to the Court of Arbitration for Sport to reduce the ban but both claims were rejected in April.
The ICC was unavailable for comment when contacted by Press Association Sport, although it is almost certain to welcome Butt's statement as it looks to stamp out the threat of match-fixing.
The governing body will also have to decide on whether to act on a plea from Butt to reduce his ban, and possibly make a return to domestic cricket, following his apology.
Reports in Pakistan have suggested Butt, who has two years left on his suspension, and Asif have also both agreed to begin a rehabilitation programme which they hope could help reduce the lengths of their bans.
Butt revealed he has asked the Pakistan Cricket Board's chief Najam Sethi to lobby the ICC - which is currently sitting for its annual conference in London - to reduce the severity of his ban.
"I request the interim chairman to request the ICC to reduce my and Asif's bans," he said. "I have two years' ban left so if the ICC allows me to play domestic cricket then I will be ready for international matches once my ban ends. "I have enough cricket left in me and when my ban ends I am ready to play for the country again."