Suarez, who was banned for nine international games and barred from all football-related activity for four months, vowed that there would never be another incident like it again.
"The truth is that my colleague Giorgio Chiellini suffered the physical result of a bite in the collision he suffered with me," a tweet from Suarez’s personal account read.
"I deeply regret what occurred. I apologise to Giorgio Chiellini and the entire football family. I vow to the public that there will never again be another incident like [his bite]."
Suarez had steadfastly denied biting Chiellini and wrote a letter to FIFA saying he had simply lost his balance and fallen on the Italian.
But FIFA ruled that he acted intentionally and promptly handed him the longest ban ever imposed on a player at the World Cup, prompting fury in his South American homeland, where he was given a hero's welcome on his return.
In response to the apology, Chiellini tweeted to Suarez: “It’s all forgotten. I hope FIFA will reduce your suspension.”
It is the third time Suarez has been banned for biting after incidents involving PSV's Otman Bakkal in 2010 and Chelsea's Branislav Ivanovic in 2013.
His latest ban means Suarez can next expect to step on a football pitch on November 1 when Liverpool play Newcastle United in the Premier League.
The Uruguayan Football Association (AUF) has notified FIFA that it intends to appeal against Suarez's punishment.
They now have until next Sunday to submit their written reasons for the appeal.
The appeal will be handled by FIFA's Appeal Committee, which is chaired by Larry Mussenden of Bermuda and which is a separate body to the Disciplinary Committee.
- Sports & Recreation
- Giorgio Chiellini