Defender staying until start of 2015
Robinson has made five appearances so far for Pompey, helping them keep a clean sheet in three of those fixtures
Blues boss Andy Awford said: “Paul fitted in here right away, so we’re delighted that he’s remaining with us and are grateful to Millwall for allowing him to stay.”
The 32-year-old centre-back made his debut in the Capital One Cup victory over Peterborough earlier this month.
Paul Robinson has extended his loan stay at Pompey from Millwall until January 5.