Pompey are keen for West Brom duo George Thorne and Joe Mattock to extend their loan stay.
Blues boss Michael Appleton has admitted he wants to keep the West Brom pair, who are at Fratton Park until the start of January.
And with reports that Tal Ben Haim will be leaving in the new year, Appleton is keen to strengthen the squad.
He said: ‘People have seen the quality they can bring to the club. They are two young players desperate to play.
‘If there is an opportunity to keep them for longer, then I’m sure we will look into that. There are two or three more games before that, though.’