So going into the final weekend 4 teams, Biarritz, Leinster, Llanelli and Munster, have already secured their places in the knockout stages while another 6, Castres, Leicester, Ospreys, Paris, Sale and Wasps, battle it out for the remaining 4 spots. Pool 1 Wasps sit top going into the final round of matches but in a vulnerable position as Castres sit 4 points behind them as the two sides clash at the Stade Pierre Antoine this Saturday. Wasps will qualify if: A - They win B - They draw C - They lose but get a bp D - They lose but Castres don't get a try bp Castres only have 1 way of qualifying, by winning with a try bp and denying Wasps a losing bp in the process. Pool 2 Leinster have already qualified as pool winners but a win away to Gloucester should secure a home draw for the Irish province, whereever that may be played. Pool 3 By securing their last minute draw in Swansea Paris go into the final round knowing they'll top the pool regardless of events elsewhere if they beat Calvisano at home with a try bp, should be a formality for GalthiÃ©'s outfit. But here's where it gets interesting the other match sees the Ospreys travel to Sale with both ideally gunning a win and a try bp. For Sale that's their only chance of qualifying while for the Ospreys a win will be enough if Munster deny Leicester a losing bp and one of Castres/Wasps don't finish on 20 points, should both finish on 20 points then the Ospreys will need the try bp to avoid a countback on tries with Castres. Pool 4 Munster and Leicester battle it out at Thomond Park for the top spot in Pool 4. It will be Munster's last game at Thomond Park until 2009 so I don't think there's any chance that they'll lose their record in this game and with the chance to knock out Leicester and make the defence of their title that little bit easier than I'm sure they'll be gunning to deny them the losing bp as well. Pool 5 The Scarlets wrapped up this group with their emphatic win over Ulster in atrocious conditions on Saturday. A win and a try bp will give them a home quarter final against one of the best runners up. Pool 6 Biarritz travel to Northampton knowing that they can become the first team to go through the pool stages with maximum points. Northampton's try difference has them pretty secure for a quarter final spot, provided the Ospreys don't get maximum points and Munster and Leicester don't draw, in that case they could go out unless they can secure a losing bp themselves. A win for Northampton by 4 tries will see them top the pool provided they deny Biarritz a losing bp, any other circumstance and Biarritz top the pool.