The 22 year-old returns in place of Brendon Daniel, who scored two tries against Montferrand last Sunday, but will be forced to watch from the sidelines as he suffered a broken thumb.
And Christophers is well aware of the size of the task ahead.
'We've got to win. It doesn't change anything, we've got to win the game. If we don't win then we're out.
'Leinster have won five out of five in the pool and we'll certainly have to be on top of our game.'
'We showed against Sale that we can play in wet weather and we've shown in several other games that we can play in dry weather. Whatever the conditions, we'll be prepared for it.'
With great traveling support last weekend, Peter Thorburn's Shoguns will be looking forward to performing in front of a strong Memorial Stadium crowd.
Christophers added:'Hopefully a lot of people will come. We need a great crowd to push us on. It makes a huge difference. Everything about home advantage makes a massive difference, it can mean 10 points a game. It's a big occasion. Hopefully everybody will come.'
Aside from the inclusion of Christophers, Shoguns head coach Peter Thorburn sticks with the same side that beat Montferrand 30-22 in France last Sunday.
Bristol Shoguns: L. Best, D Rees, A Higgins, D Gibson, P Christophers; F Contepomi, Agustin Pichot; A Sheridan, P Johnstone, J White, G Archer (c), A Brown, M Salter, R Oakley, R Beattie
Saul Nelson, Emiliano Bergamaschi/Scott Morgan, Darren Crompton, Michael Lipman, Peter Richards,
Leinster Lions: G Dempsey; D Hickie, B O'Driscoll, S Horgan, G D'Arcy; C Warner, B O'Meara; R Corrigan (capt), S Byrne, E Byrne, L Cullen / A McCullen, M O'Kelly, E Miller, K Gleeson, V Costello
Replacements: P Coyle, G Hickie, A McCullen / A Kearney, D Dillon, B O'Riordan, N Spooner, D Quinlan