The open revolt among rugby's players and coaching staff against plans to extend the Aviva Premiership season to 10 months has deepened, with one recent England international labelling the plan "unsustainable madness".
Last week, The Mail on Sunday revealed the anger felt by players, who could be expected to play almost year-round rugby from 2019-20 under Premiership Rugby's plans.
Players union chairman Christian Day is demanding to meet Premiership Rugby bosses to seek assurances over compulsory rest periods, but has so far been unable to secure a face-to-face meeting.
Day has refused to rule out strike action, while Bath rugby director and former All Blacks captain Todd Blackadder has become the latest coach to slam the proposals as unworkable.
Alex Corbisiero, the former England and Lions star, added his voice to the row, saying on his NBC Scrum Down podcast: "I am a big fan of Premiership Rugby, but my honest opinion is that this is a mistake.
"I don't think it is sustainable or workable. I think it is kind of madness to have an 11-month season, where internationals especially are expected to be playing again six or seven weeks after their last test, if there are to be no internationals missing Premiership games.