Arsenal goalkeeper Petr Cech could be absent for as long as three weeks due to a hamstring injury, according to manager Unai Emery.
The 36-year-old was replaced just before the break during the 2-0 Premier League win over Watford and replaced by English top flight debutant Bernd Leno .
Cech has remained Arsenal's number one despite the arrival of Leno from Bayer Leverkusen but is now set for an enforced spell out of the first team.
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"I don’t know [when Cech will return now," he told the media .