"I hear he's playing regularly and he used to run marathons so fitness won't be a problem. We're a little older than the opposition these days so some divine intervention may be a help during the game."
He said he had known Bishop Duckworth for a long time and described him as "a very, very cool guy" who can connect with anybody and any audience.
Collegiate Headmaster Tim Wilbur is impressed by the Bishop's outing.
"We're thrilled to have Bishop Duckworth here for the chapel centenary, and then with this game he really is connecting at grass roots with the school - in more ways than one," Mr Wilbur said.
The 1pm appearance will be marked by a personalised playing shirt for the "Bishop in boots", bearing his initials "JD" and the number 1 on the back.