Mourinho took over from previous coach Mauricio Pochettino back in November and has been tasked with bringing silverware back to north London.
Sessegnon said: "As a young player, it's a manager that you want to work with because they know so much about the game and to help you improve you as a player, so it's a no brainer.
"The gaffer wants to push on next year, I can't see why we won't be pushing for the top 2 or 3.
"We've got a very strong squad, if we can keep everyone like the key players, its a strong squad. If we can add some bits to it we can go all the way and I know the gaffer is looking to win title."
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