Chabal suspended for 3 weeks for punch
French rugby player Sebastien Chabal arrives to appear before the disciplinary commission of the French National Rugby League on January 3, 2014 in Paris
The 36-year-old former France international will miss his club's second division matches against Carcassonne, Narbonne and Albi before being available again on January 27.
During the December 14 match against Agen, Chabal had thrown a punch at Giroud, who was holding onto his shirt at a breakdown and preventing him from getting away.
Chabal pleaded guilty to an act of "brutality" and arriving at his hearing added: "In any case, the (television) pictures prove I'm guilty."
Giroud was knocked unconscious and had to be carried from the field on a stretcher before being taken to hospital for a medical check-up.
The bearded Chabal was shown a yellow card for the strike, which many observers felt was too lenient.
Chabal later apologised for his over-reaction saying it was "regrettable but a reflex action".
He told newspaper Le Progres: "There's not much else to say, except to apologise for my angry behaviour, which is not acceptable on a rugby pitch."
He had faced a suspension of between two weeks and one year at his disciplinary hearing on Friday.
In October, Clermont scrum-half Morgan Parra was given a four-week suspension, reduced to two on appeal, for raining punches down on Bordeaux-Begles' Spain flanker Gautier Gibouin.
Last January Racing-Metro's France hooker Dimitri Szarzewski was banned for 10 days, plus 20 days suspended, for having also punched No.8 Giroud.
The punch has become a Youtube hit.
Chabal played 62 times for France, mostly in the back row but also at lock.
He was known as an impact player who put in crunching tackles and was used as a battering ram to gain hard yards with ball in hand.