Arsenal could be without Takehiro Tomiyasu until September following his knee surgery.
According to The Times, the Japanese defender might be sidelined until the start of the upcoming season.
The 24-year-old sustained a notable injury during the Gunners' Europa League clash against Sporting CP in March which led him to become unavailable for the remainder of the season.
The full-back has made 32 appearances this season for the North London outfit, proving only two assists in all competitions.