A Scottish Football Association disciplinary tribunal threw out the wrongful dismissal claim and the midfielder will now miss Saturday's Scottish Premiership clash with Kilmarnock and the home match against Ross County.
Thomson took exception to Gavin Gunning's follow-through after a clearance from the United defender and grabbed the Irishman, sparking a melee.
United considered an appeal in Gunning's red card but decided against it.
- Sports & Recreation
- Scottish Football Association
- Gavin Gunning
- Scottish Premiership
- wrongful dismissal