The English full-back was injured in the 77th minute of the game after a tackle from William Saliba, and he was forced to leave the pitch to receive medical attention.
Howe expressed his concern for Livramento's absence, highlighting the player's significant contributions to the team's performance so far this season.
The team's poor start to the season has been further impacted by the defeat to Arsenal, with Newcastle sitting 15th in the Premier League table after six matches and only one win.