They will meet Aston Villa or Middlesbrough, with Socceroos captain Mile Jedinak's goal in the first leg of their playoff giving the Villans the advantage before Tuesday's return leg.
One of the reasons cited for not taking Sessegnon to Russian Federation is his lack of big-game experience but last night he showed he is a player for the major occasion.
Trailing 1-0 to Derby County from the first leg, Aleksandar Mitrovic was unlucky to see a first half header brilliantly saved by Scott Carson. We showed more defensive concentration in the first leg, but in the second, we didn't do that.
The boosted price of 23/20 (2.15) on Mitrovic to score in 90 minutes is set to be extremely popular as Fulham aim for a Premier League return after four years away.
The defeat marked the second time in three seasons that the Rams have fallen at this stage and the former Birmingham and Burton manager said that his side's decision making was to blame.
First he blocked Kamara's swerving shot, then tipped over Ryan Fredericks' dipping effort before saving the best until last when he miraculously kept out Mitrovic's powerful header.
They conceded after just 10 minutes - to Mitrovic, no less - when the sides met in March and after half an hour in the league match at Craven Cottage in November, meaning Fulham will be confident of their main striker finding the net.
A long ball in was beautifully chested down by Stefan Johansen to Sessegnon, who showed composure to slash the ball high past Carson.
That did not bother the home side too much, though, as their game management was impressive, failing to allow Derby to mount any serious pressure.
Fulham fans celebrate on the pitch.
