In any other year, England slipping from fourth to fifth would not carry any real significance.
But the seedings for the 2015 Rugby World Cup draw, which takes place in London on December 3, will be based on the world rankings.
England face Australia, South Africa and New Zealand over the next three weekends and must regain their spot in the top four if they are to be top seeds for their home tournament.
Ireland slipped a place to eighth following their defeat to South Africa, with Argentina moving up one spot on the back of their victory over Wales in Cardiff.
The top four in the world on December 3 will be the seeded teams in each World Cup group, with each pool then allocated one team from the second tier and one from the third.
If the draw was held now, England, Wales, and Ireland would all be in the second tier of nations along with Argentina. Ninth-placed Scotland would in the third tier with Samoa, Italy and Tonga.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.