Takehiro Tomiyasu is doubtful for Arsenal's trip to Watford, Mikel Arteta has confirmed.
The Japan international hasn't featured for the Gunners since the Carabao Cup semi-final second leg defeat against Liverpool towards the end of January because of two separate calf problems.
Despite returning to the matchday squad for the 2-1 win over Brentford, Tomiyasu suffered a setback ahead of the victory over Wolves last week and missed out altogether.