The Blues have parted company with the 59-year-old after almost four years in the Fratton Park hot seat.
Saturday’s defeat to League Two Salford in the Papa John’s Trophy proved the final straw for the PO4 hierarchy.
With worry they’ll miss out on the League One play-offs amid a run of six defeats in eight matches, they’ve taken the decision to axe Jackett.
Now Mark Catlin has said the search is on to find a replacement with 13 league games remaining.
Here are the current bookmaker odds with Sky Bet...
(odds correct at the time of publication)
9. Michael Duff - 10/1
Duff has done a sterling job at Cheltenham and has been touted by some fans. Photo: SHAUN BOTTERILL
10. Sol Campbell - 12/1
Pompey's 2008 FA Cup-winning captain has been nibbled at in the betting. He's been out of work since departing Southend following their relegation to League Two last season. Photo: Pete Norton
11. Michael Appleton - 20/1
Many Pompey fans' ideal candidate but Appleton signed a new long-term deal at Lincoln not long ago. The Blues would have to pay compensation. Photo: Pete Norton