Worcester and Perpignan have earned five points each from those contests and if they still cannot be separated then the club who has scored the most tries in the two matches go top - and Perpignan are ahead 3-1 on that score.
"We have just got to look after ourselves in our two remaining games, make sure we get the bonus point and do all we can do to get the maximum 10 points and see where we end up," said Warriors' head coach Richard Hill ahead of their Round 5 contest at Rovigo.
"We are going to have to hope that Bizkaia Gernika or Rovigo play well enough against Perpignan to deny them a try bonus point but it's not in our hands now. If Perpignan beat the other teams with a try bonus point then they will go through.
- Rovigo have lost 26 matches in a row since they last celebrated a victory in Europe, that came against French side Dax in October 2008.
- Worcester Warriors inflicted Rovigo's heaviest European defeat earlier this season with a 90-3 defeat of the Italians. It was also Worcester's record European victory.
- Worcester have won seven of their last nine Amlin Challenge Cup ties, averaging 43 points scored per game.
- Worcester's Joe Carlisle is the tournament's top points scorer with 50 in his two appearances to date.