Frank Roche comes onto the replacements bench in place of Blaney.
The decision to withdraw Sheahan was taken today in trviso following the customery afternoon training session.
Sheahan was having trouble with a knee injury and although it isn't deemed to be too serious, coach Alan Gaffney said that it would not be in ther interest of the player or indeed the team itself for Frankie to play on Saturday.
Shaun Payne; John Kelly, Mike Mullins, Rob Henderson, Anthony Horgan; Ronan O Gara, Peter Stringer; Gordon McIlwham, James Blaney, John Hayes; Donncha O Callaghan, Paul O Connell Jim Williams (Capt), David Wallace, Anthony Foley
Replacements: Frank Roche, Simon Kerr, David Pusey, Stephen Keogh, Eoin Reddan, Jeremy Staunton, Jason Holland.
Munster v Benetton Treviso Heineken Cup - Round 5 Saturday, January 24th. Kick-off 2.30pm (local time)