Heffernan was riding In Salutem in the Irish Stallion Farms European Breeders Fund “Bold Lad” Sprint Handicap (Premier Handicap) and crossed the line second behind George Bowen.
The stewards found him guilty of dangerous riding when he interfered with An Saighdiur and Creggs Pipes.
In Salutem was disqualified and placed last. His appeal was heard but the ban was upheld by the appeals committee and it begins in September 27.
As well as the two days of the Arc fixture, Tipperary hosts a big card on the Sunday.
Meanwhile, Marcus Tregoning is looking forward to seeing Secret Pursuit make her first competitive start since November in tomorrow’s Denny Cordell Lavarack & Lanwades Stud Fillies Stakes at Gowran.
Although the daughter of Lawman has been off the track since ploughing through the Saint-Cloud mud to win a Listed prize 10 months ago, she has not been sidelined by injury, with Tregoning merely keeping his powder dry with a filly that seemingly relishes an easy surface.
She travels to Ireland for her comeback appearance and will have the assistance of Joseph O’Brien in the saddle for the extended nine-furlong Group Three.
Tregoning said: “She’s very well. She handled cut in the ground last year and that’s why we’ve waited until the autumn.”