Reigning champions, Leinster, will know a win over Bath would secure their position at the top of Pool Three and put them in the driving seat for a Heineken Cup quarterfinals place.
The Dubliners, who were crowned European champions last season, came home with a 18-13 away win from the Recreation Ground in the first clash of the double-header between the sides.
Leinster have moved the clash against the 1998 winners to the Aviva Stadium, the new home of Irish rugby, on Saturday evening.
The Irish province have an impressive home record and have won their last eight games in Dublin in the tournament, while Bath have lost their last three away games in Europe.
Bath, who last qualified for the quarterfinals of the Heineken Cup in 2009, need to return home to the West country with a victory from their trip to Dublin if they are to keep their hopes of qualification alive.
Leinster: 15 Rob Kearney, 14 Isa Nacewa, 13 Eoin O'Malley, 12 Fergus McFadden, 11 Luke Fitzgerald, 10 Johnny Sexton, 9 Eoin Reddan, 8 Jamie Heaslip, 7 Shane Jennings, 6 Sean O'Brien, 5 Devin Toner, 4 Leo Cullen, 3 Mike Ross, 2 Richardt Strauss, 1 Heinke Van Der Merwe.
Replacements: 16 Sean Cronin, 17 Cian Healy, 18 Nathan White, 19 Kevin McLaughlin, 20 Rhys Ruddock, 21 Isaac Boss, 22 Ian Madigan, 23 Gordon D'Arcy.
Bath: 15 Sam Vesty, 14 Jack Cuthbert, 13 Matt Banahan, 12 Olly Barkley, 11 Nick Abendanon, 10 Stephen Donald, 9 Michael Claassens, 8 Simon Taylor, 7 Guy Mercer, 6 Francois Louw (c), 5 Ryan Caldwell, 4 Dave Attwood, 3 David Wilson, 2 Chris Biller, 1 David Flatman.
Replacements: 16 Ross Batty, 17 Nathan Catt, 18 Anthony Perenise, 19 Will Spencer, 20 Andy Beattie, 21 Chris Cook, 22 Tom Heathcote, 23 Ben Williams.
Date: Saturday, 17 December
Venue: Aviva Stadium, Dublin
Kick-off: 18:00 GMT
Referee: Romain Poite (France)
Assistant referees: Patrick Pechambert (France), Eric Soulan (France)
TMO: Daniel Gillet (France)
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