The German was absent from Arsenal’s open training session put on for the fans at the Emirates Stadium on Wednesday.
Havertz has only just returned from a long-term hamstring injury which kept him out between February and May.
The club are assessing the situation and are waiting for the injury to settle before further analysis.
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More to follow.
Sky Sports to show 215 live Premier League games this season
This season, Sky Sports’ Premier League coverage will increase from 128 matches to at least 215 games exclusively live.
And 80 per cent of all televised Premier League games this season will be on Sky Sports.
