With three of the four rounds complete in the Heineken Champions Cup pool stage, eight of the last 16 teams are now confirmed, but there's still a lot of jostling to be done for the final seedings this weekend.Leinster are qualified and almost certain to have a home tie, while things are less sure for Munster and Ulster.Munster are well placed to finish in the top eight of Pool B, but will need some luck elsewhere if they're to stand a chance of getting home advantage in the last 16, while the permutations are relatively simple for Ulster, who remain in the hunt thanks to their losing bonus points.POOL ALEINSTERThe only team in the competition with three bonus point wins from three, their qualification for the last 16 is already secured, and they look a safe bet to be playing in Dublin in the next round and beyond, ahead of welcoming Racing 92 to the Aviva Stadium this Saturday (3.15pm, live on RTÉ Radio 1, RTÉ2 and RTÉ Player).Another bonus point win would guarantee a first place finish in the pool, and give them a significant advantage in the knockout stage, allowing them to play every remaining game in the capital, including the final if they get there.Given their huge points difference advantage over the Cell C Sharks and Saracens, Leinster would also realistically finish top of the pool if they beat Racing 92 without a bonus point.In the unlikely event of a draw (or even a situation where Leinster finish with two bonus points), Leo Cullen's side would earn home advantage in the Round of 16, and finish third place in the pool at worst, and if they were to lose with a bonus point, they would also still finish inside the top four and have a home game in the next round.Even if they were to lose against Racing without