Mason underwent surgery after a clash of heads with Gary Cahill.
Some newspaper reports suggested the 25 year old was “fighting for his life” after the incident, but the club have since eased fears about his condition.
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Arsenal manager Arsene Wenger says he “regrets everything” about pushing a fourth official.
He was seen shoving Anthony Taylor after being sent to the stands for his angry reaction to the awarding of a penalty for Burnley during their Premier League game.
Arsenal eventually won the match 2-1.
Wenger says he shouldn't have done what he did.
The opening game yesterday saw Southampton ease past Leicester 3-0.
