Manchester United are looking to at least sign one more player before the end of the window, but Mourinho stressed that he won't be complaining if the club don't get another new signing in.
In search of goals, United turned to last season's second-highest scorer.
"We are much better organised at every level".
The Belgium worldwide had earlier missed from just a few yards out with the goal gaping, but Mourinho was pleased with the way his £75m summer signing responded.
"But I was not thinking of it [buying him] because I always thought I never like to go to players that I think are the impossible mission and I felt there was no chance. I don't think I am in a position of moaning, crying, contesting or to say I am not happy with it", the Portugese continued. However, this Sunday marks the beginning of a new Premier League campaign for The Red Devils.
However, Mourinho will welcome Eric Bailly and Phil Jones back in to the squad after they missed the Super Cup defeat to Real Madrid in midweek through suspension.
As for Tottenham, they've yet to add anyone, but they didn't do too badly a year ago with the players that they have now.
It remains to be seen where Zlatan Ibrahimovic will be playing his football this season following his release from Manchester United.
Stoke City, Burnley, Arsenal, West Ham United, Hull City, AFC Bournemouth, West Bromwich Albion, Swansea: these are all teams that came to Old Trafford last season and somehow left with a point, despite being dominated all game. We got a central midfielder, a striker, obviously the 25 per cent would be for a player from the sides, but we have players. Antonio Conte seemed no stranger to the top tier of English football as he rallied the Stamford Bridge faithful to the Premier League title in his first season.
"When I joined Manchester United past year I thought immediately that we needed a kind of Matic but there are not many".
Arsenal also have a new striker to go to war with, in the form of Alexandre Lacazette, but most of their hopes could lie on the future of two longer-serving players.
Jose Mourinho believes Manchester United are equipped to maintain his remarkable second season success rate by winning the Premier League title this term. We were playing a team full of fantastic players, we discussed the result until nearly the end. "But now after the sale of Matic, we need to try to accelerate this process for Bakayoko after his injury", he added.