O’Sullivan was handed down the punishment for hitting Damien Cahalane with his hurley in the first minute in Thurles.
The Central Competitions Control Committee contacted the Waterford County Board last week to notify them of the proposed ban.
However, the player was only informed of it on Thursday evening at which time the suspension was confirmed and it was too late to seek a meeting with the Central Hearings Committee.
O’Sullivan will not now be available until the All-Ireland quarter-finals should Waterford progress through the backdoor.
KILKENNY (SHC v Galway): E Murphy; P Murphy, JJ Delaney, B Kennedy; K Joyce, J Tyrrell, C Buckley; P Walsh, R Hogan; W Walsh, M Kelly, TJ Reid; C Fennelly, R Power, E Larkin.
Subs: D Herity, M Walsh, B Hogan, J Holden, C Fogarty, L Ryan, T Walsh, H Shefflin, A Fogarty, JJ Farrell, J Power.
TIPPERARY (SFC v Cork): P Fitzgerald (Fethard); J Coghlan (Moyne Templetuohy), P Codd (Killenaule), C McDonald (Aherlow); C O’Riordan (JK Brackens), R Kiely (Arravale Rovers), P Acheson (Moyle Rovers); S O’Brien (Ballina), G Hannigan (Shannon Rovers); P Austin (Borrisokane), I Fahey (Commercials), B Fox (Eire Óg Annacarty); C Sweeney (Ballyporeen), M Quinlivan (Commercials), B Grogan (Aherlow)
DONEGAL (SFC v Antrim): P Durcan; E McGee, N McGee, P McGrath; F McGrath, K Lacey, A Thompson; N Gallagher, R Kavanagh; C Toye, L McLoone, R McHugh; P McBrearty, M Murphy, C McFadden.
Subs: M Boyle, Declan Walsh, L Keaney, M McElhinney, O Mac Niallais, David Walsh, D Molloy, D O’Connor, L Thompson, M O’Reilly, H McFadden.
LAOIS (SFC v Fermanagh): G Brody, P McMahon, D Booth, P O’Leary; D Strong, P Begley, C Begley; C Meredith, J O’Loughlin; J Finn, B Sheehan, N Donoher; R Munnelly, D Kingston, D Conway.
LONGFORD (SFC v Derry): D Sheridan; D Brady, B Gilleran, F Battrim; CP Smieth, E Williams, S Mulligan; J Keegan, K Diffley; M Quinn, F McGee, P Barden; A Rowan, B Kavanagh, S McCormack.