Arsenal Football Club Gael Clichy is set for a four-week lay-off.
The France international played in the 3-0 win over Tottenham Hotspur on Saturday, but he has picked up an injury to his lower back which will keep him out for a month.
Clichy missed the end of last season with a back injury and was replaced by Kieran Gibbs, who impressed during this time and is set to deputise again.
Arsene Wenger also has other injury problems ahead of the UEFA Champions League tie with FC Twente, most notably to Nicklas Bendtner who is also set to miss four weeks, with a groin problem.
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