The former Fulham man has played 41 times for Portsmouth, who currently lie 12th in the Premier League, and has represented his country on 38 occasions, scoring nine goals.
Portsmouth boss Tony Adams was however boosted by the news that England right-back Glen Johnson, who is continuing his rehabilitation from a bruised knee and twisted ankle, is in line for a potential return against Manchester City at the weekend.
Johnson returned to training alongside ankle injury victim Younes Kaboul last week, while winger John Utaka returned on Monday.
Midfielder Richard Hughes, who also came off against Arsenal with a slight adductor strain in his knee, is expected to return in a fortnight.
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