Irish province Connacht will make their debut in the Heineken Cup when they run out against English rugby's league leaders Harlequins at the Twickenham Stoop on Friday.
The Irish provinces will all compete in the Heineken Cup for the first time - with Connacht as the tournament's newcomers - after Leinster lifted the Heineken Cup final in 2011.
The 'Quins, who lifted the Amlin Challenge Cup trophy for a third time with a victory over Stade Français in Cardiff last season, are unbeaten in the English Premiership this season, having won all eight of their league games.
But this game will see two former Irish team-mates - Eric Elwood, the Connacht coach, and Connor O'Shea, the 'Quins chief - locked in a battle of wits in the English capital city.
Harlequins: 15 Mike Brown, 14 Seb Stegmann, 13 George Lowe, 12 Jordan Turner-Hall, 11Sam Smith, 10 Nick Evans, 9 Karl Dickson, 8 Nick Easter, 7 Chris Robshaw, 6 Maurie Faasavalu, 5 George Robson, 4 Ollie Kohn, 3 James Johnston, 2 Chris Brooker, 1 Joe Marler.
Replacements: 16 Joe Gray, 17 Nic Mayhew, 18 Kyle Sinckler, 19 Tomas Vallejos, 20 Luke Wallace, 21 Danny Care. 22 Benjamin Urdapilleta, 23 Tom Williams.
Connacht: 15 Gavin Duffy, 14 Brian Tuohy, 13 Eoin Griffin, 12 Dave McSharry, 11 Tiernan O'Halloran, 10 Miah Nikora, 9 Paul O'Donohoe, 8 George Naoupu, 7 Ray Ofisa, 6 John Muldoon, 5 Mike McCarthy, 4 Michael Swift, 3 Rodney Ah You, 2 Adrian Flavin, 1 Brett Wilkinson.
Replacements: 16 Ethienne Reynecke, 17 Ronan Loughney,18 Dylan Rogers, 19 Dave Gannon, 20 TJ Anderson, 21 Frank Murphy, 22 Niall O'Connor, 23 Henry Fa'afili.
Date: Friday, Novermber 11
Venue: Twickenham Stoop, London
Kick-off: 20.00 (20.00 GMT)
Referee: Jérôme Garces (France)
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