Andre Green is expected to be absent from Pompey duty for around a month.
That is the initial timeframe pencilled in by the Blues to be without their winger following minor knee surgery.
Green yesterday underwent the procedure to remove a cyst from his right knee after feeling continued discomfort.
The loanee from Aston Villa revealed on his Twitter account that the problem had dogged him for the majority the year.
The issue had previously ruled him out of last weekend’s trip to Peterborough, with Kenny Jackett’s side winning 2-1 in his absence.
It is now estimated Green will remain on the sidelines for another month as he recovers from the operation.
The 20-year-old has made two appearances for the Blues since arriving on a season-long loan from Championship side Villa.
He had featured five times for Steve Bruce’s side this campaign, including starting against Wigan in a 3-2 success.
In-form Ronan Curtis replaced Green on the left-hand side of the attacking three for the Peterborough trip, contributing with two assists.
Curtis had returned from international duty with the Republic of Ireland to reclaim his Pompey spot.
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