Team news and preview as leaders Leinster aim to beat Glasgow Warriors at the RDS to secure top spot in the Pro12.
Scotland wing Tommy Seymour says he can scarcely believe his journey from Ulster 'reject' to British & Irish Lion.
New Zealand-born lock Brian Alainu'uese will remain at Glasgow Warriors for a further two years, pending a visa.
A much-changed Glasgow Warriors side cruise to a bonus-point victory over Zebre in the Pro12.
Audio & Video
Glasgow coach Gregor Townsend recognises Saracens are favourites to win their Champions Cup tie but insists his side can prevail.
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This week's sport on the BBC includes coverage of the World Snooker Championship, Russian Grand Prix and radio commentary of Anthony Joshua v Wladimir Klitschko.