The Japan international has played just six minutes this season following a three-month absence due to a knee issue that saw him miss the campaign’s start.
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After reports emerged that the Gunners were considering surgery for his troublesome knee, the 26-year-old has now been operated on to recover and be fit for next season.
In an Instagram post, Tomiyasu said: "I'm late in reporting this, but I had surgery on my right knee a few days ago and have already started my rehab to do what I love the most again.
"It has been the toughest period in my career for sure and it carries on a bit more but I won't give up.
“Thank you for your support and see you again."