The French veteran wrote himself into Reading folklore by firing in the penalty that sent the Berkshire side to the Championship play-off final.
After a tight first leg at Craven Cottage which ended in a 1-1 tie, it looked the same was going to happen again until one mistake changed the outcome of the game for both teams.
Reading have missed six of their 12 penalties this season, while Leicester fans will still shudder at the thought of Kermorgant's Panenka-style spot-kick miss in their playoff defeat against Cardiff in 2010.
As expected, the Leeds following flocked to Twitter to mock their rivals and add to their misery. Who they will face at Wembley is yet to be decided, as Sheffield Wednesday take on Huddersfield in the other semi final tomorrow.
The winning strike came from the boot of Yann Kermorgant after referee Martin Atkinson awarded Reading a controversial penalty for a handball by Tomas Kalas.
However, Reading were clinging on for the final 20 minutes, with Al Habsi pulling off a stunning save to tip Kevin McDonald's shot over the crossbar and ensure it will be Jaap Stam and the Royals running out at Wembley at the end of the month.More news: Jays' Liriano placed on 10-day DL with shoulder problem
Stam said: "We trained on penalties yesterday and Yann was the only one who scored!" "That is why I hoped it would be finished in 90 minutes".
The feisty first meeting between the two teams had prompted mixed reactions from both managers with Jokanovic frustrated his side had been unable to make more of home advantage while Stam was forced to rue the loss of McShane that took the gloss off an impressive display. In the second half, we started well.
Minutes later, Reading stopper Ali Al-Habsi had to pull off a fine save of his own as he kept out a low drive from the marauding Ryan Fredericks. And after counting the votes, we have discovered you think that Kermorgant is the 27th best player in the Football League. "As a player it was great to get there and as a manager it will be fantastic".
In what was an ill tempered affair, Reading's Paul McShane was dismissed from the field after a unsafe tackle on Fulham's Kevin McDonald by referee Stuart Attwell, and with a further four yellow cards brandished by the official, we could be set for more the same tonight, in what is sure to be another highly intensive atmosphere.
"To get this result today - against a very good team by the way - I'm very happy with that".