With tickets for the must win game for the Pool leaders selling fast - the Lions' gates have grown from 7,200 for their opening game against Biarritz Olympique to 14,200 for the game against Sale Sharks - Leinster officials are hopeful of topping the Heineken Cup record attendance for a Pool match of 22,000.
That record was set by Toulouse when they met Bath at Le Stadium, Toulouse, on 15 January, 2000. The following season the French side also had a crowd of 20,000 for their opening Pool match at the same stadium against Saracens.
Leinster took the bold decision, backed up by ERC, to switch their Heineken Cup games from their traditional Donnybrook ground to the home of Irish rugby last summer and their loyal fans - and new supporters - have certainly benefited from the move. The Donnybrook capacity is only 7,500, with the majority of the fans forced to stand.
"ERC is delighted that Leinster's brave move to switch their games to Lansdowne Road has worked so well for them this season. It was a move that paid off for both the club and the tournament last season when we staged their quarter-final and semi-final matches there," said ERC Chief Executive Derek McGrath."We had a record quarter-final attendance of 42,750 for Leinster's victory over Biarritz Olympique and then a semi-final record of 37,000 for their defeat by Perpignan. Now they could make it a hat-trick of attendance records for the Pools, quarter-finals and semi-finals stages of the Heineken Cup."