In a statement on their websitethe FA said its Disciplinary Commission had rejected Ronaldo's claim for wrongful dismissal.
His three-match ban starts immediately, meaning he will miss Burton Albion, the Dippers and the return against Blackburn Rovers on Jan. 25.
No doubt he'll have a break in a warmer climate though.
The Mirror:
Cristiano Ronaldo could be on his way out of Manchester United this summer in a £20million deal after his training ground bust-up with team-mate Ruud van Nistelrooy.
A host of Europe's top clubs, led by Real Madrid, Juventus and Valencia, have been alerted by Ronaldo's latest spat.
Juventus and Valencia have already made contact with Ronaldo's advisers about a potential move, believing that the youngster's unique style and flair is more suited to the leagues of Italy and Spain.
Ronaldo has endured a miserable time on and off the pitch this season and his United team-mates have grown frustrated with his self-indulgence on the ball during matches.
That frustration boiled over in the training ground clash with van Nistelrooy, which could be the catalyst for a summer departure from Old Trafford.