Pompey fell behind in controversial circumstances as Aaron Ramsey, who looked to foul Marlon Pack in the build up, bundled the ball into the goal past Josef Bursik.
The Blues responded after the break, with John Swift calmly finishing in the box to net his first goal for the club.
Check out our player ratings as John Mousinho’s men earn a hard-fought point against promotion favourites Leicester.
5. Connor Ogilvie - 7
Likewise to Williams, Ogilvie had a lot on his plate down the left-hand flank up against the dangerous Abdul Fatawu. The left-back stepped up to the occasion to limit the Foxes' winger. | John Mallett/ProSportsImages
6. Marlon Pack - 7
Pack’s impressive performances continue following his return from injury. Was at the forefront of everything Pompey did in the first half and always looked to take hold of the ball to start a new attack. Did quieten slightly after the break. | John Mallett/ProSportsImages
7. Andre Dozzell - 7
Despite a quiet first half, the midfielder sprang to life after the break. Combined excellently with Swift and Minhyeok in the second half to cause Leicester all kinds of issues. | John Mallett/ProSportsImages
8. Conor Chaplin - 6
(Replaced by Mark Koszonvszky on 61 minutes) Ipswich loanee was incredibly sloppy on the ball a number of times in the first half as his struggles continue on the right wing. Evident his best position is not out wide. | John Mallett/ProSportsImages