Neil Harris has stressed Ben Thompson’s future remains at Millwall.
The on-loan midfielder has made a superb impact at Pompey since arriving from the Lions in August.
Thompson has made 15 appearances this season, winning man-of-the-match plaudits against Oxford, Fleetwood and Burton.
Some Blues fans have called on Kenny Jackett to try to sign the 23-year-old on a permanent basis.
Thompson was on the periphery of things at Millwall before arriving at Pompey.
Nevertheless, Harris has insisted the Sidcup-born talent is on loan at Fratton Park to bolster his chances of becoming a Lions first-team regular down the line.
The Millwall boss told londonnewsonline.co.uk: ‘Ben is at Portsmouth to be part of Kenny Jackett’s squad and to learn under Kenny.
‘The aim is for him to get valuable game time at a level we know he is very good at.
‘Once his loan finishes he has to come back and become a regular in our first team.
‘My thought process on that hasn’t changed and won’t change.
‘Ben is a super lad and a great Millwall player of the future.’