Sessegnon's lightning quick on the field, but not in a tearing hurry off it, preferring to stick with Fulham, helping them to promotion, and now rewarded with a starting place on the grand stage of the Premier League, playing high up the field with Joe Bryan brought in at left back from Bristol City.
United have so far signed three players this summer - Brazil midfielder Fred for £47m, Portuguese defender Diogo Dalot and third-choice goalkeeper Lee Grant.
"I am not confident", Mourinho said.
"I'm not confident, I'm not confident and the market closes today so is time at least for me to stop thinking about the market because the market will be closed".
"I will have to focus on the players I have in relation to the first three matches, because after Spurs there is an worldwide break and I have a couple of weeks to recover people and prepare them better".
"It looked like I was saying something absolutely out of order, something insane, I repeat: Pre-season hard when you don't have your players to work, that's as simple as that". We are expecting a plethora of deals to go through today as English clubs battle to complete their final transfer business before the deadline of 5pm. "The information I have is no".
Mourinho had warned it would be a "difficult season" if United did not make any more acquisitions and it now looks like his side will miss out.
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Those issues have provided an unwelcome backdrop to a hard pre-season, United's makeshift side having suffered defeats to Liverpool and Bayern Munich.
However, former Newcastle striker and the all time leading Premier League goal scorer Alan Shearer thinks that Mourinho's whinging is unwarranted, and his side will be a force to be reckoned with.
Sergio Romero, Antonio Valencia, Marcos Rojo, Dalot, Ander Herrera and Nemanja Matic will all be unavailable for Friday's opener against Leicester.
"They've got a manager in Jurgen Klopp who the players have got a lot of faith in and they've got fans who will keep this team going".
"Because it is very important their feeling and to understand how they think they can help or not help".
Mourinho did confirm that Alexis Sanchez, who was a highlight for United over pre-season, is fit and firing though.