Montpellier have reported a fifth positive Covid-19 test ahead of their Heineken Champions Cup game against Leinster.
Leinster have postponed training until Tuesday as they await the latest PCR testing results.
A round-up of the rest of Saturday's European action, which included wins for reigning champions Toulouse and Leinster.
We look ahead to Saturday's five Heineken Champions Cup games as Europe's top competition kicks off for another year.
Recap Friday's United Rugby Championship action as Leinster, Edinburgh and the Sharks pick up wins over Connacht, Benetton and the Bulls.
Recap Saturday's United Rugby Championship action as Ulster won at Leinster, Benetton beat Glasgow and Edinburgh won at the Dragons.
Andy Farrell makes four changes to his Ireland XV to take on Argentina as Conor Murray, Joey Carbery, Robbie Henshaw and Robert Baloucoune start.
Ireland's Johnny Sexton has been ruled out for up to six weeks after being forced off injured during Saturday's 29-20 win over New Zealand.
Ireland's Andy Farrell has made one change to his starting XV to take on the All Blacks, as Ulster lock Iain Henderson comes in to start.
Johnny Sexton will pick up his 100th Test cap for Ireland vs Japan, while Jamison Gibson-Park and James Lowe are both picked to start.
Johnny Sexton will make a decision on whether to play in the next Rugby World Cup after the 2022 Six Nations.
Recap Friday's United Rugby Championship action as Leinster won at Glasgow and Scarlets ended their poor run at home vs Benetton.
It was a bumper Saturday of action in the United Rugby Championship, with six games taking place throughout the day.
Stormers and Glasgow draw while Leinster hammer Zebre and Glasgow edge Lions in Saturday's United Rugby Championship.
Dragons' miserable record against Irish provinces continued as they fell to another loss at the hands of Leinster in an error-ridden match.
Recap Saturday's United Rugby Championship action as Leinster, Munster, Edinburgh and Benetton began their seasons with victories.
Defending European Cup champions Toulouse will begin their title defence in Cardiff, in a repeat of the inaugural 1996 final.
Defending European Cup winners Toulouse will face Wasps and Cardiff in 2021/22; Premiership champions Harlequins will play Castres and Cardiff.
Robbie Henshaw has been ruled out of the British and Irish Lions' fixture against the Sharks on Wednesday because of a 'mild hamstring injury'.
Ireland's Ronan Kelleher has joined the British and Irish Lions training camp in Jersey as front row cover, though not in any formal capacity.
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