Lousi was penalised in the 43rd minute for a shoulder to the head of Ratu Tagive, the Glasgow winger who had just landed on the ground after fielding high ball with the score at the time 10-0 in favour of the Warriors.
Referee Frank Murphy brandished the red card and Lousi will not be able to play again until November 9, meaning he will miss Scarlets’ PRO14 games against Benetton, Edinburgh and Zebre.
A PRO14 statement read: “Lousi was shown a red card by referee Frank Murphy (IRFU) under Law 9.13 – a player must not tackle an opponent early, late, or dangerously.