SYDNEY (AP) -- Australia playmaker Quade Cooper has apologized for using an expletive in a Twitter outburst hours after the Wallabies beat Argentina in a Rugby Championship test at Mendoza on the weekend.
Cooper, who has 455,000 followers on the social-networking site, deleted the post and added another saying: "Apologies for any offensive language used on my Twitter feed ... I appreciate the support."
Cooper, who was the starting flyhalf in Australia's championship opener against South Africa on July 18, went on as a replacement in the 34-9 away win over the Pumas but received a yellow card for a late, high tackle on an Argentine player.
He said his tweet was a reaction to a personal attack from a critic.
"As footballers, we are still human beings. We've still got feelings and I bit back at some criticism and I used some language that probably shouldn't have been used," Cooper was quoted as saying by the Australian Associated Press. "I'm disappointed in myself for getting trapped in that. It's happened to me many times and I've been able to brush it off but this one time it got to me.
"I should never have let it, but that shows the passion that I have for this team."
Cooper was sanctioned earlier in his career for describing the environment under then-Wallabies coach Robbie Deans as "toxic."
Current head coach Michael Cheika said the language Cooper used in his weekend tirade was a "mistake" but didn't expect there to be any serious repercussions.
"People make mistakes," Cheika said. "I've certainly made a few in my time and that's all it is.
"It's all about discipline and we're all trying to improve that on and off the field. People have a right to have an opinion but it's about having the discipline to deal with it."