The Japanese star limped off the field, prompting tests to assess the extent of the injury. Tomiyasu will be out for between three to four weeks.
The 25-year-old former Bologna defender has emerged as a crucial figure in Arsenal’s backline, filling in for Ben White, who has been struggling with a muscular problem.
Tomiyasu is also versatile enough to deputise for Oleksandr Zinchenko at left-back. He leaves a massive hole behind in his absence.
Arsenal has pivotal encounters looming, including a clash with former boss Unai Emery, who now leads Aston Villa, on Saturday.
They then engage in high-stakes Premier League battles against Brighton & Hove Albion, Liverpool, West Ham United and Fulham.
Tomiyasu’s absence leaves a significant void in manager Mikel Arteta’s defence as we head into the fixture-packed festive season.
Even if Tomiyasu can make a comeback, the Asia Cup begins on January 12, and he will be away with Japan.
The news of Tomiyasu’s absence casts a shadow over the squad’s prospects during the hectic Christmas period.
The defensive setback comes at a time when the Gunners can ill-afford any more injury concerns. Arteta must navigate a challenging fixture list with a depleted defensive unit.
Arsenal are gunning for their first Premier League title in 20 years and need all hands on deck as they pursue a trophy that eluded them last year.
They currently top the table with five points and will be hoping this is the year they can end their embarrassing league drought.
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