Ulster continue their Heineken Champions Cup campaign on Friday night.
Dan McFarland's men take on Harlequins in the second of two back-to-back games against the English side.
Last week Ulster claimed a narrow 25-24 win in Belfast.
Here's some information on this latest meeting between the sides:
When and where is Harlequins vs Ulster?
The game is being played at the Twickenham Stoop on Friday, December 13.
What time is kick-off?
The match starts at 7.45pm.
Is the game on TV and can I stream it?
There will be live coverage on BT Sport 2 and BT Sport Ultimate. The game will also be streamed on the BT Sport app. The match is also being shown live on BeIN Sports.
Team news
Harlequins: Ross Chisholm, Vereniki Goneva, James Lang, Francis Saili, Cadan Murley, Brett Herron, Martin Landajo; Santiago Garcia Botta, Elia Elia, Kyle Sinckler, Stephan Lewies, Tevita Cavubati, Will Evans, Semi Kunatani, Alex Dombrandt.
Replacements: Jack Musk, Nick Auterac, Simon Kerrod, Dino Lamb, James Chisholm, Niall Saunders, Paul Lasike, Travis Ismaiel.
Ulster: Jacob Stockdale, Matt Faddes, Luke Marshall, Stuart McCloskey, Louis Ludik, Billy Burns, John Cooney; Eric O'Sullivan, Rob Herring, Marty Moore, Kieran Treadwell, Iain Henderson (Capt.), Sean Reidy, Jordi Murphy, Marcell Coetzee.
Replacements: Adam McBurney, Andrew Warwick, Tom O'Toole, Alan O'Connor, Matthew Rea, David Shanahan, Bill Johnston, Craig Gilroy.
Betting odds
Harlequins 7/5
Ulster 4/7
Draw 20/1
Odds from McLean Bookmakers
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