Sessegnon started for Spurs at left-wing back, before moving to an even more defensive role when Tottenham switched to a four-man back-line late on.
The youngster actually put in one of his finest performances in a Tottenham shirt to date throughout the contest.
But Mourinho insists that he still doesn’t see Sessegnon as a left-back.
“Of course he's not a left-back,” Mourinho said. “I told him at the beginning since I arrived that I have a way to develop to be a solid left-back so it's not easy for him.
“Again I repeat we are in a position where everybody has to give what they can give and I'm so, so pleased for the lads.”
Despite Mourinho’s apparent reluctance over using Sessegnon as a left-back it is actually the position he has played most frequently over his time at Tottenham so far.
Sessegnon was a bright spark last night, as his rampaging runs down the left were a threat all evening.
Sessegnon played a big part in the first goal Tottenham scored, as his movement created the opening which led to Tanguy Ndombele smashing the ball into the back of the net, via a deflection.
Spurs went on to win 3-2 against Southampton yesterday, which sets them up with a tie against Norwich City in the fifth round.
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