"It's not something urgent, that we are desperate to have it done or not done, I just think that he was very clear by showing what he did past year was not enough for him".
Ibrahimovic's one-year deal at Old Trafford expired in June and was not extended following the injury.
"He was very clear, by showing what he did past year, that it was not enough for him", Mourinho told reporters on Friday.
Mourinho acknowledged this week that Real Madrid's Gareth Bale was out of reach after the Welshman started for the Spanish side in their 2-1 European Super Cup win over United. Victor can play right-back and centre midfield.
Ahead of the Premier League opener against West Ham at Old Trafford on Sunday, he said: "My initial analysis from January and progressing through other months I was thinking of four players but I am not a hard person to work with, even if looks different or you want to make it look so".
This much was self evident, when United's new No.9 - the number which Ibrahimovic occupied last season - Romelu Lukaku deemed it necessary to seek the Swede's permission before taking his desired squad number. He thinks he can do more.More news: North Korea threatens physical actions after United Nations sanctions
"In my initial analysis, coming from January and through the other months, I was thinking about four players". Our levels of confidence and knowledge are higher so I am happy to start the season. "I'm not a hard person to work with, in spite of it looking different sometimes". I understand by doing 75 percent of what I asked, the club did very well. I don't think I am in a position of moaning, crying, contesting or to say I am not happy with it.
Hernandez is now likely to make his Premier League debut for the Hammers against his former club and said of the Red Devils ahead of the game, "It was a great experience [there] ... only happiness".
"We have a central midfielder and a striker, so obviously another player would be one coming from the sides, but we have players and if we can not strengthen then we have people we trust".
"We got a central midfielder, we got a striker".
"But if we cannot strengthen the team in this area, we have players we can trust".