"I'm very happy with the team I have".
Pushed on whether there would be any ins or outs on Thursday, Mourinho added: "The information I have is no (nothing will happen)".
"I said we would sign one or two, but the second one wasn't possible".
Mourinho warned last weekend that a "difficult season" could lie ahead if they failed to strengthen the squad before the deadline. "It is time for me to stop thinking about the market", he said.
They are now a little over 24 hours away from opening the new Premier League campaign, with Rooney looking for the Red Devils to put any problems behind them and lay down an early marker in the battle for top-flight supremacy in England.
Mourinho, who will be without the likes of Nemanja Matic, Antonio Valencia, Ander Herrera and Marcos Rojo on Friday, once again bemoaned the lack of preparation time for the start of the season, with many of his players having just returned to training after taking time off following the World Cup.
"[Alexis is] more than ready but you can not have the players who arrived only last Monday after the World Cup semi-finals or final and three weeks' holiday".
"They returned on Monday", he said.
"Is hard for me to understand, to feel, to believe we finish second".
The Red Devils coach has cut a sullen figure throughout pre-season with the former Chelsea boss unable to hide his dissatisfaction with Brazil global midfielder Fred being his sides only high profile signing.
"Is hard for me to understand, to feel, to believe we finish second - which I keep saying, and it is sometimes hard to believe, that I won eight championships and three Premier League's but I keep feeling the second last season was one of my biggest achievements in the game".
The striker turned broadcast pundit believes Liverpool's mental edge over City following three victories against them last season - twice in the Champions League and once in the league - could be the difference if City do not runaway with the title in the manner they did last season.