The injury to Havertz adds to Arsenal's fitness issues up front, with Bukayo Saka, Gabriel Jesus and Gabriel Martinelli all currently out.

Forward’s misfortune leaves Mikel Arteta having to rely on teenagers and players out of form or out of position

An Arsenal statement read: “We can confirm that Kai Havertz has sustained a hamstring injury during a training session in Dubai last week. “Subsequent assessments and specialist reviews have confirmed that the injury will require surgery, which will take place in the coming days.