Aiden O’Brien was signed, sealed and delivered with less than four hours remaining, becoming the fifth new arrival through the door this month.
With eight players heading in the opposite direction, it’s clearly been a hectic period for all involved at Fratton Park.
So, click through to see how Pompey’s winter window unfolded.
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9. IN: Hayden Carter - Blackburn (loan)
Carter was the first through Fratton Park's doors this winter in a sensible transfer for the Blues. He undoubtedly adds quality to Pompey's backline and allows them to have balance in a back three. Picture: Portsmouth FC Photo: Portsmouth FC
10. IN: Tyler Walker - Coventry (loan)
The man hand-picked by Cowley to reignite Pompey's frontline. The striker had played under the Blues boss at Lincoln in 2019 and has been on his radar ever since. However, after limited game time at Coventry this season, he may need time to re-find his match sharpness. Picture: Portsmouth FC Photo: Portsmouth FC
11. IN: Ollie Webber - Crystal Palace (permanent)
The signing of Ollie Webber made sense on a number of levels. Not only did it allow Alex Bass to depart on loan, but it gave Danny Cowley another goalkeeping disciple to learn from Gavin Bazunu. And after penning a short-term deal, the Blues head coach has challenged him to extend his stay. Picture: Portsmouth FC Photo: Portsmouth FC
12. IN: Danver Hume - Sunderland (permanent)
Hume's arrival opened a number of eyes on the south coast as Pompey paid a reported £200,000 for his services. And his acquisition solves Cowley's left-wing-back conundrum after shoehorning Lee Brown and Reeco Hackett into the position this term. The ex-Sunderland man was courted by the Blues in the summer and have finally got their man. Picture: Portsmouth FC Photo: Portsmouth FC