Leinster's hopes of an opening Champions Cup away win against Racing 92 have been boosted by the fixture moving to Le Havre's ground on Saturday, December 10.
The beaten European finalists last season will face their French rivals at the 25,000 capacity Océane stadium due to a concert by French rapper Orelsan going ahead at Racing's Arena home in Paris.
It is only the second time in Racing's history that they have played a home game in Le Havre - they beat Grenoble 34-29 in the first, in March 2015 - and that may play in Leinster's favour.
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There will be added spice to the tie given the recent confirmation that senior Leinster coach Stuart Lancaster will become Racing's new head coach at the end of the season.
Meanwhile, RTÉ will broadcast live Munster's first Champions Cup tie of the season - the mouth-watering clash with five-time champions Toulouse at Thomond Park on Sunday, December 11.
The sides met in the quarter-finals last term, with Toulouse winning in dramatic fashion on penalty kicks at the Aviva Stadium.
The Champions Cup final will take place at the Lansdowne Road venue next May and the road to the decider will begin at the GTech Community Stadium on Friday, December 9, when Declan Kidney's London Irish host Montpellier.
It is the first time in a decade that the Exiles will compete in the top-tier competition.
Meanwhile, the first South African team to participate in the tournament will be the Sharks, who will host Harlequins on December 10.
Ulster, who reached the semi-finals last season, will open their account away, in the AJ Bell Stadium in Salford, against Sale Sharks on the same date.
And Ulster's first home tie will follow a week later - the eagerly-anticipated visit of Ronan O'Gara's reigning champions La Rochelle to the Kingspan Stadium.
Click HERE for the 2022/23 Heineken Champions Cup pool stage fixtures
In the Challenge Cup, Connacht get underway at their Sportsground home against Newcastle Falcons, also on December 10.
Click HERE for the 2022/23 EPCR Challenge Cup pool stage fixtures
Given Worcester Warriors' ongoing financial troubles and the RFU's decision to ban the club from all competitions, EPCR chiefs have not included the English outfit in the Challenge Cup fixture list.
"Details of the affected Pool B matches involving Emirates Lions and Benetton Rugby are therefore yet to be confirmed," said EPCR in a statement.
"EPCR wishes the Worcester Warriors players, staff and supporters well during what is a deeply distressing period for the club, and the tournament organiser remains in regular contact with Premiership Rugby and the RFU."
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