The former All Blacks fly half has signed for the Saints, along with fellow New Zealand international Sam Harding, and they will be among the new world class names playing in the tournament.
French No 1 seeds Agen will be in Pool 2 along with local rivals Pau, London Irish and Rugby Parma while The Borders, boosted by the return of Scottish and Lions legend Gregor Townsend, are in Pool 4.
They Scottish side will face one of Townsends former clubs, the 1997 Heineken Cup winners Brive, Jonny Wilkinsons Newcastle Falcons and LAquila.
And former Scotland scrum half and new Gloucester backs coach Bryan Redpath who lifted the trophy as a player for the second time with Sale Sharks last month finds his new club drawn in Pool 3 with Bayonne, Toulon and Bucuresti.
The draw, made in the Dublin offices of tournament organisers ERC was overseen by Mark Egan, the IRBs Head of Rugby Services.
The 2005/06 tournament will consist of 20 top flight clubs from six countries playing in five Pools of four teams with the five Pool winners and the best three runners-up qualifying for the quarter-finals.
The quarter-finals and semi-finals will be one-off matches played at home venues and the final at a neutral venue on the weekend of 20 / 21 May, 2006.
The new Pool format, which will provide each of the 20 participating clubs with a minimum of six games (three home and three away), will replace the previous seasons knock-out structure and the European Shield tournament.
After lengthy ERC Board consultations involving the views of both Unions and clubs, it became evident that there were strong requirements for guaranteed fixtures and higher quality contests, said ERC Chairman Jean-Pierre Lux.
The view was that the Pool format we have followed in the Heineken Cup is the best way to meet those needs.
There will be 20 teams instead of 32 and 67 matches instead of the 86 we had last season in the European Challenge Cup and European Shield.
Part of the reason for these reductions are the facts that there is no team from Wales, Italy have requested they have just six instead of 10 teams playing in Europe two of them in the Heineken Cup and France will have 14 and not 16 teams playing in Europe as from next season, seven of those in the 2005 Heineken Cup.
Seven French, six English, four Italian and one team from each of Ireland, Scotland and Romania went into the draw. The top teams from France (Agen), England (Gloucester), Italy (Viadana), Ireland (Connacht) and Scotland (The Borders) were seeded and drawn in separate pools.
European Challenge Cup 2005 / 2006 Pools
Pool 1: Viadana, Narbonne, Northampton Saints, Bristol
Pool 2: Agen, London Irish, Rugby Parma, Pau
Pool 3: Gloucester, Bayonne, Toulon, Bucuresti
Pool 4: The Borders, Brive, Newcastle Falcons, LAquila
Pool 5: Connacht, Montpellier, Worcester, Amatori Catania
PREVIOUS MEETINGS
Pool 1
1996-97 Bristol 16 Narbonne 18
1996-97 Northampton 22 Narbonne 23
2000-01 Narbonne 53 Viadana 24, Viadana 20 Narbonne 22
2001-02 Viadana 16 Bristol Shoguns 42, Bristol Shoguns 31 Viadana 15
Pool 2
1998-99 Agen 15 Pau 11
1999-00 Agen 28 London Irish 16, London Irish 23 Agen 22
2003-04 Rugby Parma 28 Pau 33, Pau 25 Rugby Parma 6
2004-05 Pau 25 London Irish 19, London Irish 19 Pau 16
Pool 3
1997-98 Gloucester 18 Toulon 15, Toulon 16 Gloucester 13
Pool 4
No previous meetings
Pool 5
2004-05 Connacht 56 Montpellier 3, Montpellier 19 Connacht 14
The 2005 / 2006 tournament dates are:
Round 1: 21 / 22 / 23 October
Round 2: 28 / 29 / 30 October
Round 3: 9 / 10 / 11 December
Round 4: 16 / 17 / 18 December
Round 5: 13 / 14 / 15 January, 2006
Round 6: 20 / 21 / 22 January
Quarter-Finals: 1 / 2 April
Semi-Finals: 22 / 23 April
European Challenge Cup Final: 20 / 21 May