Lions prop Joe Marler has backed potential strike action against an extended playing season.
Plans are in place to lengthen the club campaign to 10 months which would create almost year-round playing seasons from 2019-20.
England No 8 Billy Vunipola has warned of an NFL style 'lock out' if there is no reduction in the number of matches amidst concerns over player welfare.
The Premiership season could soon run from September to June which, combined with international tours in July, will leave little time to recover.
'Everyone wants their piece of the pie but there's only so much pie to go around,' Marler told the Mail on Sunday.
'I don't want to sound like a wet flannel but I think the season is at its limit and it could do with some positive restructuring.
Union sources told the Mail on Sunday in April that strike action was a possibility and now players are beginning to speak publicly.
This season a number of Lions stars have been rushed back into club action with insubstantial pre-season preparation – although Marler claimed to be fine after his limited involvement on the tour.
'I only had a six-day preseason but I'm a bit anomaly because my Lions tour was basically a two-month stag-do!' he said.
'Most of the boys have been managed pretty well by their clubs, but there are some guys who have gone straight back in because clubs understandably want their best players back before they go away again.