Danny Grewcock's chances of making England's World Cup squad appear remote after he was banned from all rugby from 4 August to 15 September.
Grewcock has a very poor disciplinary record
The 34-year-old lock will miss all three of England's World Cup warm-up matches and their first two games in France, against USA and South Africa.
He was suspended for punching Clermont Auvergne's Thibault Privat in the European Challenge Cup final on 19 May.
Grewcock has 72 hours to decide whether to appeal against the suspension.
England head coach Brian Ashton is set to name his 40-man World Cup training squad on Friday.
By the time England face Samoa in Nantes on 22 September, Grewcock will not have played any rugby for four months.
He was already facing stiff competition for a place in the final 30-man squad, having been dropped during the Six Nations after the thrashing by Ireland in Dublin.
Ashton is not short of locks to choose from with Martin Corry, Louis Deacon, Tom Palmer, Steve Borthwick, Ben Kay, Chris Jones, Alex Brown and Dean Schofield all pushing for places.
GREWCOCK'S CHARGE SHEET
Jan 07 - one-week ban for stamping on Sale flanker Nathan Bonner-Evans
Jun 05 - two-month ban for biting finger of NZ hooker Keven Mealamu in Lions Test
Jul 04 - six-week ban for reckless use of boot against NZ
May 03 - two-week ban for punching Lawrence Dallaglio in Parker Pen final
Sep 02 - five-week ban after being sent off for stamping on Kyran Bracken in club game
Jun 98 - five-week ban after being sent off in Test against NZ
Grewcock, who has 69 caps, has a chequered disciplinary record and became only the second player to be sent off for England, against New Zealand, in 1998.
He received a five-week ban on that occasion and picked up suspensions on two subsequent trips to New Zealand, for reckless use of the boot in 2004 and biting Keven Mealamu's finger in the first Lions Test in 2005.
Grewcock has been sin-binned three times in the last three years for England while, at club level, he has one of the worst disciplinary records in the Guinness Premiership, having twice been sent off playing for Bath.
The first red card was quashed on appeal but the second, for punching Lawrence Dallaglio in the 2003 Parker Pen final, cost him a place on England's summer tour.
Grewcock did earn a place in England's 2003 World Cup squad but missed the triumph in Australia after breaking his hand in the pool win over Uruguay.
England kick off their defence of the World Cup against the USA on 8 September in Lens, with South Africa next up on 14 September in Paris.
Their warm-up games are against Wales on 4 August and France on 11 and 18 August.