The 18-year-old has seriously enhanced his profile during a Premier League promotion push this season, with his efforts having helped his current club to reach the Championship play-off final.
It remains to be seen whether the Cottagers will be back in the big time for 2018-19, but Sessegnon is expected to make that step up in the near future regardless of what happens in west London.
A 16 goal return in 2017-18 has seen him register on the transfer radar of leading clubs, while sparking talk of possible senior international recognition with England, and Fredericks believes it is only a matter of time before a highly-rated talent finds himself on a stage that his ability deserves.
"I have no doubt about it, and everyone at the club will say the same thing, Ryan will go right to the top,” a man who emerged from the academy system at Tottenham told the Daily Mirror.
"He will be playing for a top four club in the next few years, if not I will be very, very surprised. The ability he has got and the understanding of the game at such a young age.
"The experience he is getting over the last two seasons and the level head he has got on his shoulders, no matter how high he goes he's not going to forget where he has come from, forget his roots, and everyone around him."
Fredericks added: "[He deals with pressure] really well to be fair, it's crazy to think how young he is. He has a mature head on his shoulders.
"We've been with him in the last two years and not one of us have heard him talk about another club. He's got great respect for Fulham and he loves it here. I'm sure one day he will be playing at a top, top level.
"But he knows at the moment he is here with us at Fulham. And he is doing everything he can to make sure we're back up in the Premier League."
Sessegnon is currently tied to a contract at Fulham through to 2020, with that deal including no release clause.
He has offered no indication that he will be seeking to break that agreement this summer, but has admitted to harbouring ambitions of gracing the Premier League before too long.