Callan was riding Ballet Blanc, a 50/1 chance, for Amanda Perrett in the Unibet 3 Uniboosts A Day Handicap.
With two winners on the card already under his belt, Callan took up the running three furlongs into the contest and proceeded to ride a finish but did not apparently realise his error until the rest of the field caught him up after Ballet Blanc had been eased down.
Ballet Blanc was ultimately beaten 115-and-three-quarters of a length by the winner, Blazeon Five. Callan is banned between November 9th-12th, November 14th-19,th November 26th and November 28th.
Callan recently celebrated his first Group 1 winner since his return from Hong Kong when teaming up with old ally Kevin Ryan on Fonteyn in the Sun Chariot Stakes.
A British Horseracing Authority stewards report on the incident said: “Neil Callan, the rider of Ballet Blanc, unplaced, had appeared to ride a finish a circuit too soon. After being interviewed and shown recordings of the incident, the rider was suspended for 12 days.”
Responding to a video of the incident on social media Callan tweeted: “Yep that was embarrassing!!”